Can i still become a police officer?

So i got arrested a year ago for 2 marijuana charges and 1 dwi charge.... the 2 marijuana charges have been expunged and the officer never showed up for the dwi case so it was dismissed and im working on gettting that expunged as well... i am 21 years old i do not use marijuana any more i am also back in college and working, i realized that marijuana took my dream away from becoming a police officer and i just want to know if i can get that dream back.