HALIFAX -- The Crown argued Monday that the testimony given by a former Nova Scotia politician charged with impaired driving is sufficient on its own to convict him of the offence.

Melanie Perry said in her closing arguments that during his trial, Trevor Zinck said he spent some time behind the wheel and, along with positive breathalyzer results, proved the charge.

Zinck testified last week that after drinking at a bowling alley he initially got in the driver's seat and began driving, but he quickly switched places, allowing his friend to drive instead.

Perry called the argument a "red herring" if the judge accepts that Zinck drove his vehicle and there were two positive breathalyzer tests taken within two hours.

Defence lawyer Laura McCarthy argued some of the police officers' testimony describing Zinck's arrest after stopping his vehicle didn't match, casting doubt on their statements.

Judge Frank Hoskins reserved his decision until April 29 at Dartmouth provincial court