"There's no evidence of a crime or a sexual assault," Pimental said. "This report is simply an incident report taken at the woman's request."
The incident was initially reported online by TMZ as a sexual assault, but Pimental said the celebrity gossip news site "took the report out of context."
Team officials have not released any information about the report.
"The 49ers organization is aware of a report regarding Colin Kaepernick and are gathering facts," 49ers general manager Trent Baalke said in a statement.
Kaepernick was scheduled to attend teammate Anquan Boldin's "Q-Fest" charity function in Palm Beach Gardens that runs Thursday through Saturday.
Coach Jim Harbaugh told reporters at the Q-Fest event that he hasn't spoken to Kaepernick since details of the alleged incident surfaced earlier Thursday. "I'm aware (of the incident), but don't have anything else that I know anything about," Harbaugh told ESPNWestPalm.com.
Kaepernick's agent, Scott Smith, did not immediately return a phone message seeking comment.
The woman, whose name was removed from the report, told detectives she went to Lockette's apartment at the Viceroy Miami — a luxury resort on Brickell Avenue — to mingle with Kaepernick and wide receiver Quinton Patton and that she "mixed some drinks for them and gave them shots."
The players allegedly told her that, in order to drink with them, she needed to smoke marijuana.
The woman said the group then watched a basketball game, and shortly after she started to feel lightheaded so she went to a bedroom to rest. She says Kaepernick, with whom she has had a previous sexual relationship, came to the room and kissed her and undressed her, the report continues. She told police they did not have sex.