New verses residual use evaluation support

There are times where it is essential to distinguish new drug use from residual drug use. If the specimens are collected at least a week apart, that distinction can often be readily made. If the specimens are collected within just a couple of days, this distinction becomes more complicated. Depending on the drug involved, a scientist at the laboratory can usually distinguish between new verses residual use. Please do not hesitate to contact us and we will evaluate the results for you.