Legal Question in Criminal Law in Texas

All the officer has to have to stop you is reasonable suspicion. Sounds like he had it since he did not see a tint sticker (whatever that is). It is unlikely that he had a search warrant, so the discovery of the drugs needs to be based upon an exception to the search warrant requirement. The exception relied upon will probably be stated in the police report.

Some common ones are:

consent - you allowed the officer to search your vehicle

plain view - the officer could see or smell the drugs without searching the vehicle.

No search or warrant exception would be needed if you told the officer you had drugs on you (often a response to the the question "Do you have anything illegal on you?"

Get a lawyer.