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How will legalizing marijuana affect drivers?

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    William La Jeunesse reports from Los Angeles

  • Duration 2:38
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Your challenge now is say to legalize marijuana for medical and recreational use law enforcement agencies now working.

To develop deriving limits like those you -- for alcohol.

Pot officially becomes legal in Washington State as of today where there is already a driving limit in place what is that limit.

What do you like -- lot of that story -- West Coast newsroom William good morning.

Well -- the purpose of course is to keep impaired drivers off the road not bust pot smokers now there's no nationwide limit on marijuana like alcohol point 08.

So Washington's new standard for drug driving.

His new.

And controversy.

You I don't know -- -- Entering and smoke in the -- driving while high well -- legal research shows more drivers are choking up.

Yet studies like this one in Europe showed too much marijuana affects coordination and judgment.

One -- the first the most important thing in an inability or at reduced ability to divide one's attention.

Marijuana advocates argue pod is far less debilitating than alcohol yet a new Canadian study says those who drive within three hours of smoking pot.

Are twice as likely to cause a crash.

Another one the effects that we see with individuals to driver of the influence of marijuana.

-- that reduced ability to to perceive time and distance.

But how much is too much I don't absolutely feel that we are in uncharted territory know for a fact that we are unchartered territory.

Twelve states have -- zero tolerance level for pot in Washington State where marijuana is -- legal the limit is five -- grams per blood sample.

-- impairment levels some argue is roughly equal to alcohol.

Because we're still early on in the in the research stage it's very difficult to determine whether or not -- five milligram standard will change.

Similar -- how was -- do you bystanders had evolved over the years.

Problem is heavy users though not impaired can test positive weeks after smoking.

Also what you smoke and how you smoke it affects people differently so even experts don't know how much pot causes impairment.

-- a -- to say that.

Net debt to -- two dosages would give me five nanograms it is it -- is impossible to make that determination.

So the compound in their wanted to make you highs -- -- is teach you stored your fat.

So heavy pot smokers -- say they can smoke today get busted two weeks from now.

So this standard will likely be challenged the pot -- prefers the Colorado standard which is.

The judgment of the officer who stopped you it is new territory.

We're about to see how it goes or doesn't we in my -- thank you live -- -- there are.

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