Not long ago, we had a thread going on modern proverbs. I can't find the thread now, so I'm putting a modern proverb here.

I was reading a true-crime book, about a man who hired a loser to kill his wife. According to the author, the police have a proverb for crimes like this:

"Look at the in-laws before you start searching for outlaws."

Like most modern proverbs, it's pithy, it conveys wisdom, and it has a play on words. I like it.