What is the test for arrest without a warrant for driving under the influence of alcohol?

The constable did, however, have a concern that, if left unsupervised at the scene, the accused may have caused a disturbance or engaged in an altercation with the driver of the vehicle he allegedly struck. The accused had behaved in an aggressive manner toward the other driver and the officer arrested the accused because he believed it was necessary to avoid a disturbance or a fight in the parking lot of the North Burnaby Inn. In my view, the constable had reasonable and probable grounds to arrest the accused for this reason; that is, in the public interest to prevent the commission of another offense. The evidence establishes both the subjective and objective elements of the test for arrest without warrant articulated in Regina v. Storrey, supra.