Well that much is correct, it is the duty of law enforcement to report if they find cause for suspicion.. This is a legal forum, your personal opinion of marijuana is irrelevent here.. (And on that note, the article you posted should have been written more formally, not teeming with the author's personal opinions..)
I'd like to see them require concise reports regarding all use of such technology.. Similar to how police need to write up every incident where they even draw their gun.. It would make it more difficult to abuse that good faith clause since they'd lose the ability to say shit like 'Well I was playing around with my FLIR unit, yada yada, and stumbled across this house..' Make them log target, purpose, duration/times, direction of observation etc, and cross reference the logs with standard video that depicts the aircraft's position/orientation at all times.. Its not easy to fake proper logs after the fact, ask any trucker..