Stop panicking about the City - they have an anti-poison policy for wildlife problems - the City has consulted us about using poisons and other toxicants in the downtown area.
And we try to keep in touch with private pest control companies to keep them up to date on the peregrines and many of them prefer not to use poison as it is just too difficult to be absolutely sure nothing will happen. And besides, it doesn't solve the problem - kill the <insert species name here> and more move in because now there is a space for them in the environment.