It's probably best to avoid the police if possible if you have no information to offer. If you do have information, you can talk with a lawyer about the right w

It's probably best to avoid the police if possible if you have no information to offer. If you do have information, you can talk with a lawyer about the right way to present it, or take sufficient steps to make yourself anonymous (perhaps by having your lawyer perform all communication). I do agree that in cases like that, you will make it harder for yourself if the police stop and ask you and you refuse to say anything. I think the talk linked refers more to people who are considered potential suspects rather than witnesses.