I've had several batches of ecstasy pass through my hands in the past couple years. Of them all the only bunk, likely low dose meth pills I have come across were a batch of speckled green and white supermans.
Certain resources on the web may be able to help you check a pill, but the only way to be certain whether your pills contain MDxx is to get a testing kit.

RastaKaze, if you wont shut the fuck up at least get your facts straight. You'd have to be one lucky son of a bitch to get an "ecstasy" pill with cocaine in it.