You would likely notice the difference in the high if not the taste/appearance/smell. Bath salts
usually = 4-Methylmethcathinone or MDPV
, which produce pretty noticeable highs. MDPV would make your shards look like they were mixed with a floury substance, and likely make you feel overstimulated and paranoid much quicker then methamphetamine
alone. 4-MMC and methamphetmaine would likely feel much more euphoric then methamphetamine alone. And in both cases, part of the high would disappear long before the methamphetamine wore off.
Still, its very possible.