In the method the authors used UCT’s CLEAN SCREEN® THC solid phase extraction (SPE) cartridges for the extraction of the cannabinoid metabolites from urine samples.  The SPE extractions helped researchers achieve LOD’s ranging from 0.1 to 1ng/mL, matrix effects biases ranging from 0.4 to 10.1% and analyte extraction recoveries ranging from 65-99%. UCT is the leader in sample preparation and HPLC columns for the forensic market.