I don't practice criminal law, so my opinion isn't necessarily going to be more valuable than a non-lawyer's, but I wouldn't be worried about clen or T3. Clen is a vet drug in the US so it'll be irrelevant. Not something that can really be sold to humans under any sort of research chemical justification, but they aren't going to care about the end user, and thus won't even test for it.
T3, well, you have something that's normally available by prescription (I'm guessing not in liquid form unless compounded). It's not a scheduled substance, so at most you've got a drug without a valid prescription. Minor situation, and I'm pretty sure they won't bother testing for T3 for that reason.
You later mention the gear. Of course they can be pricks about that, and they are most definitely scheduled. It'd be useful if you could produce a prescription for the test, but you'd still be SOL wrt the tren. Matters like that will often be more technical in nature when all is said and done. They might identify a very trace amount, and let's face it, after 7 months it's probably going to have oxidized and evaporated to a decent degree, in which case perhaps your attorney can argue that it's not enough to be reliable. Your attorney can also pore through chain of custody information (once he manages to pry that from the police), particularly if those latter needles weren't found until a custodial search of your presumably impounded car. And all that would only kick in if they felt it was worth charging you with possession. They might use a paraphernalia statute in Ill to add a count instead, depending on how your laws are written.
TL;DR - The DUI is probably your biggest concern, followed by possession of gear, which you can likely fight (=have the charges dropped) if you pay a decent attorney enough money, particularly if you make it easy for the prosecution on the DUI case. Hit up AA now to start impressing the judge ahead of time, and interview lawyers. Don't jump the gun on things until you're charged on the other substance.
Well thanks for the input. When i was detained in the police station one of the police officers should me a syringle which I did use for clen but also for test and tren. Reason he showed me those ones was because it was the most visible and had a purple color to it. He also showed me a clear one which I belive was mostly t3(liquid)