MORE than 40% of drivers tested for drugs in the Pilbara since September have returned positive readings.
Pilbara police have attributed the high strike rate to their targeting method.
Karratha and Hedland stations received new drug testing machines from the end of August and close to 42 per cent of Pilbara drivers tested for illicit substances since September have come back positive for methamphetamine or cannabis.
From 360 roadside tests taken in Hedland, Karratha, Roebourne, and Dampier, 150 were positive.
Further testing taken back at police stations confirmed 128 of those drivers had recently used methamphetamine.
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