Airstrike Bird control has been employed in several hospitals.
Sites, in the process of being built, birds came into the area at night to roost and the resultant droppings held up work until the droppings could be cleaned up. A nasty and expensive job, costing time and money.
In hospitals that are already built, the HEPA filtration system can be clogged with pigeon droppings. If this happens the replacement of the HEPA filters is expensive and inefficient. Using birds of prey in the area means you can get the most out of these systems, saving time money and effort.