I agree this is probably a useless piece of shit but I posted it for people to know this is out there. Police officers are not skilled enough to use this because they have no back ground like a crime lab scientist would have so just this click and point device couldn't hold up in any real court of law. Would you want your average law man arresting you with this device when he don't even really know what the hell hes dealing with hes just been told to be on the lookout for those shiny baggies that say potpourri.