I really don't understand why you were arrested & why cops kept an eye on you..what charges they put on you...Is it because of money you got from that company or because you worked for them.
Anyways, I don't know your country loaw
But Captcha cracking works are illegal work in many company...Captcha works are meant to crack security of company, to steal login details,Credit cards,imp files etc etc.
If you worked for such company it's better to give up & move on...if such work is illegal in your country too...you are giving them (police)evidence against you.
Don't accept you worked for a some company which r involved in illegal stuff...Make some good excuse and talk to your Lawyer first.