Whilst drugs in blood and urine testing are well developed areas of toxicological analysis, drugs in hair testing is a relative newcomer.
The consequence being that issues relating to contamination, persistence and interpretation are evolving areas of research.
A newly published paper is an excellent example of research in drugs in hair testing. (1)
The study demonstrates that it is possible to manipulate (decrease) the results of hair analyses for THC by using commercially available products such as shampoos.
