You can engineer systems that effectively have an off switch (sterilized progeny with short life or a certain environmental lethality condition e.g. dependent o

You can engineer systems that effectively have an off switch (sterilized progeny with short life or a certain environmental lethality condition e.g. dependent on you constantly supplying certain substance) as well as even an API (e.g. built in features that enable integration with other genetic techniques such as insertion sites for cloning).