I'll second that:
Sci-Ally WAS NOT a DEA sting operation!!!
Nobody is going to bust you if you're doing legitimate scientific research with everything that you legally purchase (and, as a normal everyday citizen, are legally entitled to possess). The only way to prove that you are up to no good--assuming that you're up to no good--is by what you say or do in public (to people or to yourself), what you say on the phone, what you type on your computer, what you put in your trash, and, in terms of any questionable activities, what people directly see, hear, smell, taste or feel.
These suggestions about people getting busted for purchasing somewhat suspicious items--without any additional evidence to support the notion that an actual crime is being committed--are unfounded, in my opinion.
Read Strike's book, "Sources" for more information. It very thoroughly covers the topic in question.