I want to get my friend arrested.
Why are you going to get your friend arrested?
I'm planning on getting him arrested because I don't think he can be trusted.
If your friend has done something criminal then it may be right to try to get them arrested. However, if your friend hasn't done anything legally wrong, trying to get them arrested is a bad idea and may backfire, getting you in legal trouble. If you can't trust your friend, consider ending the friendship.
I know... I'll set him up and get him arrested.
That is a terrible thing to do to your friend. Why get him arrested at all? You should just leave him be.