Police internal affairs investigators in Merced, Calif. say they're looking into the complaint by 40-year-old Gregory Williams, who was arrested Sept. 11 on suspicion of domestic violence and resisting arrest, according to the Merced Sun-Star.
Williams and witnesses say officers tasered the wheelchair-bound man twice, then left him handcuffed on the sidewalk in broad daylight, with his pants down.
Williams spent six days in jail before prosecutors said they lacked evidence to charge him.
Merced officers said in a police report that Williams was uncooperative and refused to give his 2-year-old daughter to Child Protective Services.
The police department has declined further comment to the Associated Press, pending the internal investigation.