Former Alabama star and current San Francisco 49ers linebacker Reuben Foster was arrested this weekend for domestic violence and possession of an assault weapon ... making this his 2nd arrest in a month.

According to a news release from the Los Gatos Monte Sereno Police Dept., police arrested Foster after receiving a call regarding a possible disturbance. After making contact with Foster and the victim, police took Foster into custody without incident after their initial investigation.

Foster was transported to Santa Clara County Main Jail and bail was set at $75,000. He was released from custody Sunday night, per jail records.

He was booked on three separate charges -- domestic violence, threats and possession of an assault weapon. No further details were immediately available. 

Foster was also arrested in Alabama January 13 for marijuana possession.

The 49ers responded by saying ... "The San Francisco 49ers organization is aware of the report regarding Reuben Foster. We take matters of this nature seriously and are gathering all pertinent information."