In order to study the effect of para-substituents on the benzene ring of methamphetamine on drug incorporation into hair from blood, the plasma AUCs and hair concentrations of 7 methamphetamines [methamphetamine (MA), phydroxymethamphetamine (OHMA), pbromomethamphetamine (BMA), paminomethamphetamine (AMA), p- nitromethamphetamine (NMA), pmethoxy methamphetamine (MOMA) and 3, 4- ...