The only way to combat this is through whistle-blower rewards. This kind of behaviour is so damaging to the society that it's worth government monies for this - and meanwhile, you can recoup costs by fining the companies. It will at least minimize the damage, and incentivize companies away from this kind of behaviour. Some companies have billions of dollars of profits to protect, and business-wise, spending as much of that as they need to maintain the sale of their product or service is "smart" business - though if a chemical causes harm to the environment and/or people, then it needs to not be pumped into our environment.