islamabad 15 police has been given civic vti, and santro for lahore police.
actually there are many factors:-
1. i feel toyota has good relations with govt. it's not only corolla, it's toyota e.g. hilux, prado, lc, crowns, corona etc
2. they r better than others, i remember some defence org got nissan double cabins and then repent over this buy and next time took toyotas.
3. and a funny aspect, in gov. sector ppl prefer some thing that is not very mouth watering, e.g. u see some potohar, charade, cultus etc. so that big bosses dont snatch away these veh. from their subordinates. i mean, its better to stick with their old galant than to get new corolla from ur subordinate.