Prosecutors: Ex-Raider, 49er Aldon Smith had 0.40 BAC when fitted with alcohol monitor

This booking photo provided Tuesday, March 6, 2018, by the San Francisco Police Department, shows Aldon Smith. The former Oakland Raiders NFL football player turned himself into police on Tuesday and was booked into San Francisco County Jail on suspicion of misdemeanor domestic violence and three related misdemeanors. (San Francisco Police Department via AP) less This booking photo provided Tuesday, March 6, 2018, by the San Francisco Police Department, shows Aldon Smith. The former Oakland Raiders NFL football player turned himself into police on Tuesday and was booked ... more Photo: San Francisco Police Department, Associated Press Photo: San Francisco Police Department, Associated Press Image 1 of / 8 Caption Close Prosecutors: Ex-Raider, 49er Aldon Smith had 0.40 BAC when fitted with alcohol monitor 1 / 8 Back to Gallery

Former Raiders and 49ers linebacker Aldon Smith had a blood alcohol content of 0.40 — five times the legal limit for driving in California — when he showed up at the San Francisco Sheriff’s Department last week to be fitted with GPS and alcohol-testing ankle monitors, prosecutors said Wednesday.

Smith, 28, whose career has been marred by troubles with the law, had been ordered to enroll in monitoring during a court appearance last Thursday following arrests stemming from a March 3 alleged domestic violence incident in San Francisco.

He arrived at the sheriff’s department Friday evening to be fitted for the monitors, but he was extremely intoxicated, Assistant District Attorney Courtney Burris said at a brief court hearing Wednesday.

While at the sheriff’s department, Smith’s blood alcohol content rose slightly to 0.41, Burris said. He was taken into custody for violating a court order, and remains in custody on $500,000 bail.

Burris said the incident was “evidence of a severe alcohol issue” for Smith and recommended he be taken to a residential alcohol rehab facility for treatment.

Smith, wearing orange jail-issued clothing, only responded once to San Francisco Superior Court Judge Robert Foley during Wednesday’s hearing, saying he understood his rights. His attorney, Josh Bentley, declined to comment outside court.

Smith’s arrest Friday marked the third time he has been jailed in recent weeks following the alleged domestic violence incident. He allegedly assaulted a woman in a home on the 600 block of Bush Street on March 3 and fled the scene before San Francisco police arrived. He turned himself in three days later and posted $30,000 bond.

But three weeks after the alleged incident, Smith allegedly contacted the victim, prompting police to issue a warrant for his arrest. He was held on suspicion of three misdemeanor counts of violating a protective order after turning himself in.

Smith was in domestic violence court last week to face the new charges and was granted conditional release, which included not drinking alcohol. That’s when a judge ordered that he wear a GPS monitor and a SCRAM alcohol monitor. He has pleaded not guilty to charges in the domestic violence case.

The Raiders released Smith shortly after his arrest in early March. Smith played four seasons with the 49ers, but was released from the team following several brushes with the law.

Smith has had alcohol-related run-ins with the law before, including DUIs. But Friday’s arrest appeared to suggest severe addiction, one expert said.

“If he can walk around at 0.40, he has to be exceptionally alcohol-dependent already,” said Dr. Keith Humphreys, an addiction expert and professor in Stanford’s Department of Psychiatry and Behavioral Science. “That’s an exceptional amount of consumption. Anyone at that level has a serious alcohol problem.”

Humphreys said Smith would likely have had to detoxify under medical supervision in jail.

“That amount of alcohol is the equivalent of the anesthesia for major surgery,” he said. “A normal-type person would be blacked out unconscious and at risk of a coma.”

Evan Sernoffsky is a San Francisco Chronicle staff writer. Email: esernoffsky@sfchronicle.com Twitter: @EvanSernoffsky