Cannabis and amphetamines are the substances coming up most in positive work place drug  tests

A report from the Drug Detection Agency found just under five percent of samples taken between July and August showed drug use.

CEO Glenn Dobson says that's about the average for this time period and that percentage increases towards the end of the year.

He says another drug is being picked up more commonly.

Dobson says cocaine is still marginal but it's increasing in popularity.