My Canary app tells drivers if their cannabis consumption puts them over the limit

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An new app that claims to reveal whether you are too stoned to drive has been released.

Just like drink driving, drug driving is illegal in many US states and the UK - but often only if there's a certain amount of the substance detected in your system.

In some US states, confusion has arisen as a result of the decriminalisation of cannabis use.

But the new My Canary app, currently only available for iPhone, claims to help drivers make an informed decision before getting behind the wheel.

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The app (pictured) runs through a series of on-screen tests to asses your suitability to drive. These include remembering a sequence of numbers, playing a game of whack-a-mole, balancing on one foot and estimating a time period of 20 seconds
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