I've been told FLIR is less of a concern than it is made out to be. Maybe some with more experience in law enforcement can correct me, but I know for a fact it was ruled as not to be probable cause. Not to say it can't be used to build a case against you, but from what I have heard the usage of it to detect small marijuana grows has dwindled significantly. Personally, I'm legal so I don't give a shit myself lol, but I've been in your shoes and didn't care much then either. As long as you're not growing 100's of plants I'd say don't sweat it, exhaust it outdoors.