WINNIPEG - The Manitoba government is set to introduce legislation to help police crack down on drivers who are high on marijuana.

Justice Minister Heather Stefanson says the bill, expected Thursday, will also include measures dealing with health and safety concerns stemming from the expected federal legalization of pot.

Stefanson hasn't provide details in advance of the bill's presentation, but says the aim is to have checks and balances for when marijuana becomes legal.

She says technology that would let police officers test drivers for pot impairment is still being developed, and the bill will propose different tools for law enforcement.

Stefanson says she's concerned by a survey from Manitoba Public Insurance that said one in 10 drivers who took part in a voluntary test had drugs in their system.

More than half of those with drugs in their system tested positive for marijuana, while cocaine came in second.