It can be. The thing is, if it stinks, then that's the solvents. Pharmaceutical amphetamine doesn't smell of anything.
True. Nor does it feel corrosive when you snort / plug it.
Street speed's a different game though - no one feature is totally reliable in judging the quality of it, either by sight or by smell, other than taking a small amount and seeing how far it goes. It all depends on the manufacturing process, the cuts, the smell of the dealer's freezer, whatever.
Certainly most of what's out there is unfortunately bunk. Wish I had some decent stuff right now though.

