What makes a defendant incompetent to stand trial in Texas?

Q: What makes a defendant incompetent to stand trial in Texas?

Gerardo Solis III v. State: A judge’s 'vibes check' or a party's polite courtroom demeanor cannot override evidence of mental incapacity; if there is even a scintilla of evidence that a party cannot rationally assist their counsel, the court is legally required to halt proceedings and appoint a competency expert.

This question has been addressed in 1 Texas court opinion:

Gerardo Solis III v. State

COA13 — February 19, 2026

In *Solis v. State*, a defendant's counsel raised a suggestion of incompetency during a revocation hearing, supported by testimony of the defendant's mental regression and inability to assist in his defense. The trial court dismissed these concerns after a brief colloquy where the defendant answered basic questions clearly, concluding he was competent. The Thirteenth Court of Appeals reversed, holding that a trial court abuses its discretion when it weighs evidence of competency against evidence of incompetency during an informal inquiry. The court clarified that if there is 'some evidence' (more than a scintilla) from any source suggesting incompetency, the trial court must stay the proceedings and appoint an expert rather than relying on its own courtroom observations.

Litigation Takeaway

“A judge’s 'vibes check' or a party's polite courtroom demeanor cannot override evidence of mental incapacity; if there is even a scintilla of evidence that a party cannot rationally assist their counsel, the court is legally required to halt proceedings and appoint a competency expert.”