TIAFT Young Scientists "Workshop 2001"

The Finnish experience from the ROSITA project

Marielle Grönholm and Pirjo Lillsunde

National Public Health Institute, Laboratory of Substance Abuse, Mannerhemintie 166, 00300 Helsinki, Finland

In the Finnish part of the Road Side Testing Assessment (ROSITA) evaluation both urine and saliva devices were included. The saliva devices were performed roadside by police and urine in a laboratory. Samples were obtained from drivers suspected to be driving under the influence of drugs. Both police and physicians made an impairment evaluation of the suspected drivers. The police were trained to do the on-site tests.

The on-site results were compared with laboratory results, Gas Chromatography-Mass Spectrometry methods covering up to 200 commonly abused substances. The samples were tested for amphetamines (AMP), cannabinoids (THC), opiates (OPI) and cocaine metabolites (COC) by the on-site devices. Some of the devices also included a metamphetamine (MET) and a benzodiazepine (BZO) test. Both positive and negative samples were tested. A total of 800 persons and eight on-site devices for urine and two for oral fluid testing were included in this study. Good results were obtained for the urine on-site devices, with accuracies of 93-99 % for amphetamines, 97-99 % for cannabinoids, 94-98 % for opiates and 90-98 % for benzodiazepines. However, differences in the ease of performance and interpretation of test result were observed. Particularly one of the oral fluid devices was difficult to interpret and the other was difficult to use. It was possible to detect amphetamines and opiates in oral fluid by the used on-site devices, but the benzodiazepine and cannabinoid tests didn't fulfil the needs of sensitivity.

ABSTRACTS