1. Observation of illegal substances 

While the odor of marijuana alone no longer creates probable cause to justify a warrantless search of  a vehicle at a traffic stop, if an officer can clearly see or smell other contraband  they have probable cause to search the vehicle. Once they’re searching, it’s not uncommon for something else, legal or not to lead to a more serious charge. 

2. Suspicious Movements 

When drivers or passengers start reaching under seats, stuffing items in glove boxes, or acting nervous, officers will often interpret that as an attempt to hide contraband or access a weapon. That escalates the encounter and may lead to a pat down, vehicle search, or worse. 

3. Talking Too Much 

People try to talk their way out of tickets all the time—and end up talking themselves into a criminal investigation. Admissions like “I only had two drinks” or “I smoked earlier today” are all the officer needs to begin field sobriety tests or drug evaluations. Silence is your best protection. 

4. Refusing to Comply 

You absolutely have rights—but how you assert them matters. Refusing to hand over documents, arguing, or ignoring lawful orders (like stepping out of the vehicle) can lead to obstruction or resisting arrest charges—even if the initial stop was questionable. 

Bottom Line: 

A routine stop can quickly spiral into a criminal case. Your best defense? Stay calm. Say little. Comply with basic commands. And call a lawyer immediately if things go sideways.