Great news for Ed Oliver ... the Buffalo Bills' rising star is getting his DWI and gun charges dropped because of insufficient evidence, prosecutors confirmed to TMZ Sports on Wednesday.
The 22-year-old former first-round pick -- who had a rock-solid rookie season for Buffalo last year -- was arrested back on May 16 in Montgomery, Texas after cops say he was drunk driving.
Officers claim witnesses told them they saw Oliver swerving and driving dangerously at around 9 p.m. ... and they say when they eventually caught up to Ed, he was doing 80 mph in a 45 and illegally passing people.