A 74-year-old woman was arrested over the weekend after she allegedly used bear spray during an argument in a Trader Joe's parking lot in Lafayette. Lafayette police were called about 10:40 a.m. Saturday to the store in the 3600 block of Mt. Watch NBC Bay Area News free wherever you are WATCH HERE WATCH HEREWitnesses told officers that the woman was arguing with someone and allegedly pointed the bear spray out her driver's side window and sprayed someone. As the other person drove away, she allegedly sprayed the repellent a second time, police said. Eight people were exposed to the bear spray and were treated at the scene by Contra Costa County Fire Protection District crews.