What it is
A request to keep an expert witness opinion out of evidence because the expert is unqualified, the methodology is unreliable, the opinion does not fit the issues, or the testimony would not help the factfinder.
Pretrial / scheduling · Daubert
Motion to Exclude Expert Testimony
Asks the court to exclude unreliable or unhelpful expert opinions before trial.
When it's used
Filed after expert disclosures and depositions, usually before summary judgment or trial. Parties use it to challenge scientific, technical, medical, financial, engineering, and industry opinions.
What the other side does
The proponent defends the expert qualifications, data, methods, application, and helpfulness. It may submit declarations, deposition excerpts, studies, or a request for a Daubert hearing.
Common outcomes
The court may exclude the expert entirely, limit particular opinions, deny the motion, or hold a hearing. Exclusion can make a claim or defense impossible to prove.
Not legal advice. Motion practice varies by court,
judge, and case type. Local rules and standing orders frequently
modify the federal defaults shown here. If you're facing a motion
or considering filing one, talk to a lawyer about strategy and
timing for your specific case.