What is your best illegal lifehack?

I know they are paywalled but they give so much information.

I had a contractor that took my money and ran. I used one of those reverse lookup sites with just his name and phone number and I got his address as well as his relatives.

He did not like the fact I had a deputy serve him his court appearance or the time when I called his mother to confirm his data before the court date.

Long story short, I won the case. He claimed no assets so I will never get paid back.