The Denver Post reports Jennifer Knowles’ three boys were operating a stand in Denver’s Stapleton neighborhood over Memorial Day weekend, but their business venture supporting a charitable cause was shut down after a visit by police.

The officers told the family that they needed three different permits, including one that costs $100.

City Council members gave preliminary approval Wednesday for a bill that would allow children to sell lemonade, coffee or tea at a neighborhood stand.

The measure would pose restrictions, including an operating limit of 84 days per year and the children would be prohibited from selling near permitted food vendors.