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Drivers are toking up. studies like this one in europe show too much marijuana effects coordination and judgment. >> one of the first and most important being reduced ability to divide one's attention. >> pot is far left debilitating than argue many argue. new canadian study say those who drive within three hours of smoking pot are twice as likely to cause a crash. >> another we see driving under the influence of marijuana reduce the ability to perceive time and distance. >> how much is too much? >> i don't absolutely feel that we are on uncharted territory. i know we are for a fact on unchart...

Alcohol. a new study says those who drive within three hours of smoking pot are twice as likely to cause a crash. >> the other effects we see with individuals who drive under the influence of marijuana is the reduced ability to perceive time and distance. >> how much is too much? >> i don't absolutely feel that we are in uncharted territory, i know for a fact we are in uncharted territory. >> 12 states have a zero tolerance level for pot. in washington state where marijuana is legal the limit is 5-nanograms her blood panel, some argue that is equal to alcohol. >> it's very difficult to determi...

Impairment level some argue is roughly equal to alcohol. >> because we're still early on in the research stage, it's very difficult to return whether or not that standard will change. similar to how the dui standards have evolved over the years. >> reporter: 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. >> for anyone to be able to say that two hits or two dosages would get me five nanograms, it nearly is impossible the make t...