go to ur local police deparment and ask them... idiot.. there really is no way of telling untill u smoke it.. and than u feel a different buzz.. dealers most of the time dont lace it.. they lose money.. i know ppl who lace the weed to get grisl to do shit which i think is stupid but ye.. u wont really know if its laced even if u do smoke it... cuz u migth feel a better high but most of the time ppl think it was jus really good weed..