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Police Commissioner Karl O'Callaghan revealed police were not aware of Troy Buswell's involvement in what they had thought was a regulation traffic incident until Sunday.
The WA Treasurer crashed his ministerial car about 1.30am on February 23, after hours of drinking at a wedding.
On Monday morning Premier Colin Barnett announced Mr Buswell's resignation from Cabinet.
At a media conference on Monday the Commissioner said there was no possibility of a drink driving charge, even if Mr Buswell admitted he was under the influence at the time, because there was no under blood alcohol reading.
Mr O'Callaghan confirmed police received a complaint on February 23 of a car being driven erratically on Roberts Road, Subiaco but said officers were not aware Mr Buswell was involved.
When a patrol car arrived at the scene shortly afterward the gate outside the units was closed and the lights were off.
The officers assessed that there was minor damage to the car and did not attempt to gain entry to the premises, Mr O'Callaghan said.
Addresses of members of government are normally registered with police, but neither of the two Subiaco units were registered to Troy Buswell, so it was not flagged with police.
The car was registered as being leased to the office of state administration.
Mr O'Callaghan said he became aware of the incident on Sunday as a result of calls from the media, and informed Police Minister Liza Harvey the same day.
Mr O'Callaghan said he had not yet spoken to the two officers who attended the incident but expected to speak to them sometime on Monday.
Police are speaking to the complainant on Monday.