If you have a vehicle newer than 2007, it can be easily tracked using the TPMS sensors, which each transmit a unique 32-bit ID.
There are a lot of plate scanners about now, and software exists to analyze CCTV footage and extract plate data from any camera connected to any network. Tracking someone is fairly trivial if you're really determined.
And if you're enough of an important target to have devices planted in your home or vehicle, unless it was done by the local yokel cops, you won't find them, period. They will record data and periodically "dump" to a nearby collection point, probably using spread-spectrum which will sound like a 1/1000th-of-a-second burst of static if you happen to be lucky enough to be monitoring the right frequency when it does transmit.
And all of that doesn't really matter, because if they really want to, they'll just fabricate enough evidence to screw you in a kangaroo court anyway. Look at what they did to DJT, who has USSS protection, lots of expensive lawyers, and for all intents and purposes, nearly unlimited financial resources and instant national recognition and probably close to 100 million supporters. How do you think you'll do in a federal court with a public defender who was 99th out of 100 in their law school class? Ask all the J6 defendants, they weren't all nailed because of cellphone data.