tulsa county sheriff 's office reserve deputy robert bates faces a charge of second-degree manslaughter for the april 2 shooting of eric harris .
records include training certificates , job evaluation reports and weapons training and qualification records dating to 2008 .
some of the records seem to indicate bates was proficient in firearms and dozens of other training courses .
he kept his taser near his chest and his gun on his right side - but insisted the mix-up could have happened to anyone .
bates said he had completed all proper training and was not allowed to ` play cop ' just because he had donated equipment to the sheriff 's office .