Well not exactly...
We (the company that I work for) are in possession of thousands of gambusia in some of our ponds and no-one can prosecute us or compel us to get rid of them.
In fact I would like to get rid of them and replace them with native fish.
However since it would cost us over $5000 to get permission to release native fish, let alone the actual eradication costs, I can't come up with a sound business case for getting rid of the gambusia.
So the gambusia multiply and multiply...