Your mouth is your worst enemy. As far as Infrared , if they use it and they don't have a warrant to , then it's an illegal search (check your local laws to make sure). They have to have a very good reason ,i.e: probable cause in order to obtain a search warrant.As far as buying lights , nutrients , etc. chill out , the cops have much more pressing things to do than worry about a closet grow-op.The main thing is to keep your eyes open and your mouth shut.