To be more specific, you can test for primary and secondary amines.
Marquis indicates whether an Ecstasy like substance is present. The X-TREME test will tell you whether the pill is mixed with another amine.
Difficult stuff, please make sure you understand what is going on before testing.
aj
ps A nice feature of X-TREME is the ability to pick out MDMA/PMA combinations
[This message has been edited by aj (edited 28 September 2001).]