Is eating road kill a health-hazard?
Animals that are killed, independent on the method, have to be examined by a veterinarian and a sample should be tested. When the test comes back clean, the animal can be butchered and eaten.

However, a restaurant kitchen is not an abattoir and there's a high risk of cross-contamination. Think about the fur, the dust, the lice or other insects on the carcass. This means a restaurant should not butcher animals. Period.

If you take a road-kill home, take a sample (the tongue) to the local vet.