Diamond CBD's chief executive officer said he was surprised to learn about tainted e-liquids. "Our products are all subject to third-party testing," said Kevin Hagen, who was in Las Vegas attending the MJBiz Con, the world's largest marijuana and hemp business conference. "I suppose any type of product could be tampered with or modified by someone with a syringe." He says the company is looking into the case and doing all it can to ensure the best-quality product is on the market.