I could totally see the government trying to pull that, but I would think they would focus on people dropping serious cash on tons of product. Like I just picked up 9 grams of trest, and will grab a little more before the bans rolls in. So, I doubt I'd even be considered. But if someone bought 1000 grams, yeah, they would raise alarm.
Not to mention that it would still be illegal search ans seizure, so everything would get thrown out.