I did a citizen's arrest on a possible illegal immigrant and confiscated his cash
What was your reason for thinking he was an illegal immigrant anyway?
Well he was selling drugs, and I ended up confiscating his cash and drove him to the police station.
It could be very dangerous to try to make a citizen's arrest on a real drug dealer; they may hurt you. It probably isn't really legal to take someone's cash just because you think they look like they are illegal, either. You should use better judgement so you don't get in dangerous situations or legal trouble yourself.
You're one of them, aren't you?
It sounds like you assumed he was commuting a crime because of how he looked. If he was really selling drugs then I guess he was committing a crime, but your suspicion of him to me seems like it was caused by stereotyping.