Comparative studies of drug detection using recent immunologic methods

150 urine samples which we received from the criminal investigation department were measured with EMIT cannabis 20 and EMIT cannabis 50 reagents by EMIT Autolabsystem and especially with the immunoassay analyzer ETS by Syva Diagnostica. The confirming analyses were performed by GC-MS. If only cases are considered which are positive with cannabis 20 containing at least 10 ng 11-Nor-delta-9-THC-9-carboxylic acid in urine, there will be a negative result of 18.8% with EMIT 50. This appears to be unreasonably high. Some of these cases were also tested with Abuscreen ONTRAK-reagents. With this method the cut off for cannabis with 100 ng/ml urine is far too high but can be lowered essentially by taking a larger urine sample.