You can already charge. Right now, if you can prove that a person was drinking alcohol following a motor vehicle accident in order to frustrate the taking of the test later, if you can establish that, you can already charge them with obstructing justice or obstructing a police officer. There are sections in there. If you can prove that, you can charge them. As for a proof of that, if you were able to get a conviction on that basis, that's a serious offence. There is already a legislative tool there for catching people in that.
But I agree with the officer here that a lot of times you will not hear that until it comes time for trial. I have had cases where you will see a client who was followed and was observed chugging alcohol after an accident. I think an inference would be open to a tryer of fact, to a judge or a jury, that the person was doing that to frustrate the process. There is an appropriate charge that sits in the Criminal Code for that.