Knott v. State

CARVER, Justice.

Richard Knott was convicted under a Dallas ordinance making it an offense to blink one’s own car lights to warn motorists traveling in the opposite direction of a police radar trap set up to catch speed limit violators. We reverse because the State has legislated comprehensively on the same subject as the City’s ordinance; consequently the City’s ordinance on the subject was preempted and will not support Knott’s conviction.

The parties and their counsel stipulated the City’s ordinance as well as the facts. The ordinance provides:

A person commits an offense if he places,…