I?ve never done coke although i?m pretty sure i snorted crack once, anyway...
From what i?ve heard most coke is cut with levamisole. I doubt anyone has any numbers about how much coke is cut with LVM today. Levamisole suppresses the immune system and apparently causes flu like symptoms if you ingest enough. Personally i don?t think coke with any amount of levamisole is acceptable. If i were to ever do coke i would definitly clean it up with at least a dry acetone wash first.
There are test kits for levamisole online, if you want to know whether your coke is cut with levamisole these test kits are gonna be your best bet.