No you can't use it. It is no longer DCM. It is now MDC. ahhHhaah. Get it? Your methylene dichloride turned into dichloromethane...hahahaha
Of course it can be reused!! Come on man!! Get it together! UTFSE. You can alomost always reuse solvents and should. It saves time and money. Sometimes like HCL gassed solvents you may need to remove any dissolved acid and distill before reusing.
EDIT: Oh yea, I almost forgot the most important reason not to fluch your solvents. It's bad for the enviroment. And the DEA loves to tout about enviromental hazards from drug labs. So prove em wrong, dispose of everything by properly neutralized or diluting, etc!!