XTC has either meth or herion in it. Typically it will be in a persons system for 72 hours or 3 days. Same as meth.
Crack/cocaine lasts in the human body for 72 hours.
So, if you dont have a PO appt for a couple weeks, hit up the powders.
Otherwise, Whip its, Duster, Spice, Shrooms, Acid, peyote/mescaline and booze is your way to go.
It also depends what kind of UA they give you. Do they just use the immediate test strips or do they send it in? If they just use the test strips, depending on your location the drugs checked typically are marijuana, meth, and coke. However if they send it in youre totally fucked then