[gozur88]

The reason you don't talk to cops in the US or Canada (and some other countries, I assume) is by law your refusal isn't taken as an indication of guilt. So you have nothing to gain and everything to lose.

Police interrogations aren't like normal conversations. Even if you're innocent, if you misspeak it goes on the record the way you said it. Think about how many times you've been in a normal conversation and had to go back and clarify something you just said. Your friends are going to give you the benefit of the doubt; a prosecutor can use that kind of thing to make it look like you're changing your story.

There are countries in which your refusal to answer questions can be a factor in determining your guilt at a later trial, so you have to answer questions. But that's not a good thing.