For decades the same test has been used to convict drunk drivers.
Police ask a driver to stand on one leg, walk a straight line and recite the alphabet. If the driver fails, the officer will testify in court to help make a case for driving under the influence.
But defense lawyers argue, science has yet to prove that flunking the standard field sobriety test actually means that a person is high, the way it's been proven to measure drunkenness.
So, as attorney Rebecca Jacobstein argued to the Massachusetts high court, the tests shouldn't be allowed in evidence.