I'm not sure about the rules and regs in France, but here in the UK if you remove 'waste' from a clients premises, you need to register as a waste carrier, and pay for disposal
For me, it's simple. I'm paid to catch moles. When I've caught them, they belong to the customer and are therefore their waste For domestic customers, they can chuck them in the bin (or I'll do it for them) and for farmers, they can do with them as they wish.
Interestingly, 'wild' animals are exempt from the Animal (By Products) Regulations....... that's the rules that stopped them doing on farm burial of l