Yes, they can tell the difference. You could claim adderall caused a false positive, but then they would use gas-chromatography and confirm it was meth.
O@ObservantChem:
Hey guys. Looking for some cheaper opioid vendors. I can’t be spending $500 on a gram of a substance that will probably kill me with a couple weeks lol. Not literally, we’re looking for something with longevity, strong, euphoria, and inexpensive.