The Chicago City Council’s Committee on Public Safety green-lighted a contentious ordinance Thursday that would stop businesses located in dry precincts from allowing customers to bring their own bottle of alcohol, or BYOB.

At the committee meeting Thursday, Local Liquor Control Commissioner Greg Steadman said this is the first city ordinance he is aware of that looks to regulate BYOB in any manner.

Austin neighborhood Ald. Deborah Graham (29th) pushed for the ordnance due to concerns from residents about a new banquet hall that plans to set up shop in a precinct voted dry by residents. About 12 percent of the city is located in voter-approved dry precincts.

“To ensure that they didn’t have patrons falling out of this particular establishment drunk from a precinct that had been voted dry, this was adding protection to a community that had concerns for that,” Graham said at the meeting. “It’s not to hinder businesses. It is addressing their concerns. They voted it dry and they don’t want alcohol there.”

Ald. Willie Cochran (20th) strongly opposed the crackdown, saying he wanted no part in it for his ward. The alderman also stressed that catering businesses may be forced to shutdown if BYOB is not allowed in dry precincts.

Alds. Carrie Austin (34th) and Nicholas Sposato (36th) asked Steadman during the meeting what the ordinance would mean for businesses in their wards, such as hair salons and barber shops, that allow their customers to drink wine or champagne.

Under the proposed ordinance, if the business is located in a dry precinct, then customers would not be allowed to bring in any alcohol, he replied. Steadman also added that state law prohibits any business from serving free booze to customers for any type of commercial purpose.

The full city council is expected to take up the measure later this month.