Most all public service bikes require a toe clip of some type.
Also required to attend most training classes. Here are some of the most common types of peddling devices used today. Most every "Police" made mountain bike know the requirement, so they usually come with the plastic toe retention device. Be aware that a regular mountain bike more than likely will be equipped with just a flat pedal. So your choice is upgrade to one of these below. All of the pedals listed are currently available at 4Bike-Police.com
and other web retailers.
and other web retailers.