Hello, I have always considered being a police officer, but now it is something that I truly would like to do.  But there are several dings against me that i'm afraid might prevent me from becoming one.  I'm currently in college, and I was wondering if any of you could let me know if these issues are disqualifying:

-A crooked back-aches, but would not prevent me from doing my duties or from wearing a bullet-proof vest.
-Depression-currently on medication for depression.
-An arrest for breaking and entering when I was 19 years old, I was drunk after a party and thought i was kicking my friends door down, it turned out not to be his house.  All charges were dropped and I got 6 months probation.
-Past marijuana use Freshman year of college for a period of 6 months.  I abused it almost every day.

Yeah so things do not look good for me, but it is my dream and I want to give it my best shot.

infrequent MJ usage not an automatic DQ.
"Breaking and entering", aka Burglary is a felony in all States.  you said it was dropped but you got probation.  Usually, probation goes hand in hand with a conviction. If a conviction shows up, that is an automatic DQ.

Meds for depression not an automatic DQ.   
Your back? Only you can answer that one when you take the agility test.

Good luck.

Thanks!