Question about rewards

OK i have a question about offering a reward in the arrest of a deadbeat dad. My question stims on the fact my X has a warrant for his arrest, he lives in the same town as i do, but refuses to pay his child support. He owes over 20K. I wanted to get the cops involved more in the search for him, since they wont go and search him out, they have to stumble on him. So i thought i would offer a reward to the person (friend, family member, neighbor, acquaintance, ect) who would turned him in to the cops.

I thought by offering a reward for the arrest of my X, and paid to the person who turned him in i could get more attention to my case.

I was told by the cops that "IF" a person that hunted down my X and hurt him or broke the law it would make me liable. Now i got what i wanted, i wanted the police more involved in the fact that my X has a warrant, and they apparently are at his house alot. But my question is has anyone else done a reward or something similar?