Saratoga County (WRGB) – Mechanicville woman arrested after police say she drove with a baby on her lap near the Halfmoon Walmart. The Saratoga County Sheriff’s Office responded to a welfare check call at the Walmart at 1549 US Route 9 in Halfmoon on Oct. 4, at 5:27 p.m. due to reports of a female operating a motor vehicle with an infant on her lap.