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VANCOUVER -- Charges have been dropped against a man initially charged with vehicular homicide in the death of a pedestrian early Monday evening in Vancouver.

Donald Collins, 62, was struck and killed at East Mill Plain Boulevard and Andresen Road about 5:50 p.m. Monday.

The driver, Scotty R. Rowles, 47, was arrested after telling police he had smoked a bowl of marijuana within the past 90 minutes. Rowles was given a field sobriety test, a drug test, and was taken into custody on a charge of vehicular homicide.

On Wednesday, the charge of vehicular homicide was dropped against Rowles by the Clark County DA's office. Court documents obtained by KGW indicated the District Attorney concluded that further investigation is necessary in the case.

The arrest garnered additional public attention because it came within weeks after the possession of marijuana was made legal by a statewide vote in November. How police enforce pot-impaired driving laws has been part of the public policy debate since the vote.

More: Wash. faces 'driving while stoned' challenges

More:Legal pot newest target for Vanc. DUI sting

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