David Johansen
publish a notice in the paper looking for others who have had problems by the same parties. include the details that you were assaulted and they planted pot on you. you should have immediately gotten a piss test by a lab, certified that you have 0 alkaloids present, get a notarized statement from the bartender and any other witnesses of your condition and any witnesses to the second half of what happened, then file criminal charges against them (the officers) in their private capacity for violation of oath of office.
ofcourse, you should be able to use the notice of mistake (properly), and get out of the false charge.
i thought pot was legal in canada? it was atleast decriminalized here (massachusetts) for possession under an ounce.