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Motion of Defendant to Strike Affidavit in Support of Plaintiff's Motion for Summary Judgment

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Motion to Strike Affidavit

IN THE UNITED STATES DISTRICT COURT FOR THE

OF

PLAINTIFF

CAUSE NO.

V.

DEFENDANT

Motion of Defendant to Strike Affidavit in Support of Plaintiff's Motion for Summary Judgment

COMES NOW , Defendant in the above-styled and numbered cause, by and through its attorney, and respectfully moves the court, pursuant to Rule 12(f) of the Federal Rules of Civil Procedure, for the entry of an order striking the Affidavit filed by Plaintiff in support of Plaintiff's Motion for Summary Judgment on the grounds that said Affidavit fails to comply with the requirements of rule) in that

A separate Memorandum of Authorities in support of this Motion is being filed with this Motion.

Respectfully Submitted,

DEFENDANT

By

One of its Attorneys

Certificate of Service

This is to certify that I, , attorney for Defendant , have this date served a true and correct copy of the above and foregoing Motion of Defendant to Strike Affidavit in Support of Plaintiff's Motion for Summary Judgment by U.S. Mail, postage fully prepaid, to the following counsel of record for Plaintiff:

This the day of , 20 .

Respectfully Submitted,

State Bar No.

Attorney for Defendant

OF COUNSEL:

Telephone:

Notice of Motion of Defendant to Strike Affidavit in Support of Plaintiff's Motion for Summary Judgment

You are notified that on (date), at (time), or as soon thereafter as counsel can be heard, in Courtroom 000 of the United States District Court for the of , at the Federal Courthouse at , Defendant through his attorney, will move the court for an order striking the Affidavit of Plaintiff in Support of Plaintiff's Motion for Summary Judgment for the reasons stated in the above Motion to Strike.

DEFENDANT

By

Defendant's Attorney

Certificate of Service

This is to certify that I, , attorney for Defendant , have this date served a true and correct copy of the above and foregoing Notice of Motion of Defendant to Strike Affidavit in Support of Plaintiff's Motion for Summary Judgment by U.S. Mail, postage fully prepaid, to the following counsel of record for Plaintiff:

This the day of , 20 .

Respectfully Submitted,

State Bar No.

Attorney for Defendant

OF COUNSEL:

Telephone:

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What this Motion of Defendant to Strike Affidavit is and when it is used

The Motion of Defendant to Strike Affidavit in Support of Plaintiff's Motion for Summary Judgment is a pleading by a defendant seeking exclusion of an affidavit the plaintiff relies on to oppose or support summary judgment. It challenges the affidavit's admissibility, relevance, authentication, foundation, or compliance with evidentiary rules and local procedure. Typical grounds include hearsay, lack of personal knowledge, improper expert opinion, or omission of required authentication. The motion ordinarily accompanies or precedes opposition to summary judgment and asks the court to disregard the affidavit in ruling on the summary judgment motion.

Why filing this motion matters to the defendant

Striking an improper affidavit can prevent the plaintiff from relying on inadmissible evidence at summary judgment, narrowing factual disputes and protecting trial rights. It can preserve issues for appeal and ensure the record follows evidentiary rules like authentication and relevance standards.

Why filing this motion matters to the defendant

Who prepares and benefits from this motion

Parties and counsel use this motion when an affidavit lacks foundation, contains hearsay, or otherwise fails evidentiary standards.

  • Defense counsel who need to eliminate unsupported statements from the summary judgment record.
  • Pro se defendants who wish to preserve admissibility issues for trial or appeal.
  • Litigators preparing targeted evidentiary objections tied to summary judgment practice.

Proper use helps focus the court on admissible evidence and can materially affect whether a summary judgment motion succeeds or fails.

Primary users and their roles

Defense Counsel

Civil or criminal defense attorneys preparing pleadings and evidentiary objections. They draft the motion, support it with case law and exhibits, and file within local procedural deadlines to ensure the affidavit is excluded from the summary judgment record.

Pro Se Litigant

An individual representing themselves who must follow local rules for motion practice and evidence. A pro se defendant should clearly identify the evidentiary defects and cite applicable rules or authority to preserve issues for the court and any later appeal.

Core components to include in a professional motion to strike

A concise, well-supported motion focuses on admissibility grounds, cites authority, and offers the court proposed wording to exclude or redact improper affidavit content.

Caption and Relief

Court caption, case number, and a clear request that the court strike or disregard specified paragraphs or exhibits from the plaintiff's affidavit.

Statement of Facts

A brief factual background limited to the affidavit's contested statements and their procedural posture in the summary judgment briefing.

Legal Grounds

Specific evidentiary grounds such as hearsay, lack of personal knowledge, improper expert testimony, or failure to authenticate under the rules of evidence.

Authority and Argument

Concise legal citations and analogues explaining why the affidavit or portions are inadmissible under federal or state evidentiary rules.

Supporting Evidence

Exhibits, counter-affidavits, or documents demonstrating the affidavit's defects or rebutting the plaintiff's assertions.

Proposed Order

A short, ready-to-sign proposed order specifying the paragraphs struck or redactions required to streamline the judge’s ruling.

Step-by-step: drafting and filing a motion to strike an affidavit

Follow a structured process to preserve objections and comply with local rules before summary judgment is decided.

  • 01
    Review Affidavit: Identify unsupported statements, hearsay, or lack of personal knowledge.
  • 02
    Research Authority: Locate controlling case law and rules for each evidentiary ground.
  • 03
    Draft Motion: State facts, grounds, legal argument, and proposed order concisely.
  • 04
    File and Serve: Comply with local filing deadlines, e-filing procedures, and service rules.

How the motion progresses through court procedure

Understanding the typical procedural arc helps set timing and evidentiary strategy for admissibility challenges.

  • Filing: Submit motion with supporting exhibits through the court's e-filing system.
  • Service: Serve opposing counsel and confirm receipt under local rules.
  • Opposition: Plaintiff may respond; anticipate cross-references to summary judgment briefing.
  • Ruling: Judge rules—often in a written order that becomes part of the summary judgment record.

Digital workflow checklist for preparing the motion

Set up a filing workflow that tracks drafting, review, signatures, and e-filing steps.

Task Owner | Due
Draft Motion Attorney | 3–5 days before filing
Collect Exhibits Paralegal | 2–3 days before filing
Client Review Client | 48 hours review time
E-File Attorney | File by local deadline

Platform and delivery requirements for electronic submission

Confirm the court's accepted file formats, e-filing portal credentials, and signature requirements before submission.

  • Accepted Formats: PDF/A preferred; searchable PDFs when exhibits include text.
  • Signer Authentication: Use attorney e-sign or scanned wet signature per court rules.
  • Service Methods: Comply with e-service rules and certificate of service requirements.

Maintain copies of uploaded files, confirmation receipts, and service proof to preserve the administrative record and guard against filing disputes.

Key timing considerations and common filing deadlines

Missing local deadlines for motions or responses can waive issues or preclude relief; check the local rules and scheduling orders.

Local Rule Deadlines:

Follow the court's motion briefing schedule and page limits.

Summary Judgment Timing:

Coordinate motion to strike with summary judgment reply deadlines.

Service Timing:

Serve opposing counsel within the period required for responses.

Hearing Dates:

Request oral argument per local practice or accept disposition on pleadings.

Preservation:

Object early to preserve evidentiary issues for appeal.

Sequential milestones from filing to court ruling

This sequence outlines typical stages and expected next steps after filing a motion to strike.

01

Prepare Motion

Draft and attach exhibits; verify admissibility issues.

02

File & Serve

E-file and serve within the time required.

03

Opposition Due

Await plaintiff’s response or cross-motion.

04

Court Decision

Judge issues order, which affects summary judgment record.

Security and compliance considerations for electronically stored filings

Encryption: TLS 1.2/1.3 transit; AES-256 at rest
Audit Trail: Timestamps, IP, and action logs
BAA Availability: Required for HIPAA-protected data
Standards: SOC 2 Type II and ISO 27001
Authentication: Multi-factor options for signers
Accessibility: WCAG 2.0 Level AA compliance

Consequences of improper or late motions

Waiver Risk: Failing to timely object can waive evidentiary issues
Sanctions: Frivolous filings risk fee or case sanctions
Adverse Ruling: Affidavit may remain in record if motion denied
Appeal Limitations: Issues not preserved limit appellate review
Costs: Additional discovery or briefing increases costs
Ineffective Remedy: Partial redaction may be the only relief granted

Common drafting and procedural pitfalls to avoid

  • Overbroad requests that do not specify affidavit paragraphs often fail for lack of specificity and may be denied on procedural grounds.
  • Relying solely on conclusory statements without citing controlling evidence or rules weakens the motion and reduces the chance of exclusion.
  • Failing to coordinate timing with the summary judgment schedule can result in the motion being untimely or moot.
  • Neglecting local form or page limits, or omitting a proposed order, may lead to clerical rejection or adverse procedural rulings.

Practical tips for strong, efficient motions to strike

Apply focused strategies to increase the motion’s clarity, persuasiveness, and procedural compliance.

Be Specific and Narrow
Identify exact paragraphs or lines to strike and explain with pinpoint citations why those portions are inadmissible rather than asking for broad exclusions.
Support with Authority
Cite controlling district and circuit precedent and the rules of evidence; attach relevant statutes or rule excerpts where helpful.
Provide Alternative Relief
Offer redaction or limitation on purpose, e.g., exclude for summary judgment but allow at trial with proper foundation.
Use Clear Proposed Order
Attach a proposed order the judge can sign to expedite disposition and reduce clerical edits.

Practical examples of motions and outcomes

Two concise examples illustrate common grounds and judicial responses to motions to strike affidavits.

Case Study 1

A defendant challenged plaintiff’s affidavit for lack of personal knowledge and hearsay

  • Court excluded specific hearsay paragraphs
  • The court granted partial relief, struck three paragraphs, and denied punitive sanctions, narrowing summary judgment evidence and preserving trial issues.

Case Study 2

Defense counsel moved to strike improper expert opinion in a fact affidavit

  • Plaintiff failed to authenticate exhibits
  • The judge struck the unauthenticated exhibit and permitted a narrow supplementation deadline to cure authentication defects under supervision.

Frequently asked questions about motions to strike affidavits

Answers address timing, evidentiary standards, electronic filing, and preservation of issues for appeal.


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