Making a buy, two youths complete a transaction with a third youth wearing a sign on his chest that advertises Acid $1

Original Toronto Star caption: Making a buy; two youths complete a transaction with a third youth wearing a sign on his chest that advertises Acid $1.50 yesterday evening at the rock festival at Mosport. While drugs were being sold openly on the 500-acre grounds; there were relatively few incidents that appeared to cause police any trouble.