I spent 3 days in jail for smashing mailboxes when i was 17 and i used to do drugs like weed, and LSD. I have been clean for over 10 years and the only trouble i have been in, in that time is a speeding ticket like 6 years ago.
What are my chances of becoming a police officer?

Since everything but the speeding ticket happened more than 10 years ago, you could still get hired by some police departments. The rest of your background. Work history, education, credit history, and things would also be taken into consideration.

The LSD would disqualify you with my department.

I KNOW OFFICERS THAT HAVE GOTTEN HIRED WITH HAVING USED HARD DRUGS. THE TEN YEARS OF BEING CLEAN IS WHAT'S IMPORTANT!