2016’s Certain Dark Things is Canadian SF author Silvia Moreno-Garcia’s second novel.
World reaction to the revelation that vampires really do exist has varied. Some nations opted for cautious, monitored co-existence. Others simply drove the vampires out. Twenty-first century Mexico did both: Mexico was for many years a haven for vampires fleeing their former home nations, but Mexico City was declared a no-go zone for the blood drinkers.
Declaring it was one thing; enforcing it another.