A leading Dutch research centre on drugs and addiction says a total ban on drugs while driving is not feasible. The warning from the Trimbos Institute, which advises the cabinet, come in response to a call,  launched on Saturday by the Council of Police Commissioners, for zero-tolerance with help of a saliva test.

The institute says the test is flawed in a number of ways. It claims the test does not detect the use of cannabis and sleeping pills. Nor can it, it says, help determine when and which quantities were consumed. The institute points out that the test continues to detect cocaine traces days after the drug stops affecting the body. The institute advises to wait with the introduction of a saliva test until further research has been completed.
 

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