It's amazing what you can find out from the body, a while history can be pieced together by 'reading' the diferent media the body gives out. This is the basis of all SureScreen's diagnostic tests, and laboratory methods. Because hair follicles are constantly supplied with blood, even if there is a tiny amount of illicit substance in the blood, it will be locked in the core of the hair as it grows, until our unique method extracts any substances from the core. Hair analysis is the best method for detecting long term substance abuse because the evidence cannot be erased, and you can determine if the user has simply been abstaining from drugs previous to an appointment such as an interview. As little as 50 hairs are all we need, and the sample can be tested month by month or the three most recent months can be analysed.