 It has been alleged that the drive toward CNG taxis is consequence of a corrupt bargain among Dallas politicians and the large energy interests that dominate the business and civic circles of the city.To name one, Clean Energy, LP, the largest retail natural gas distributor in North Texas and majority-owned by T. Boone Pickens, is believed to be in line to reap a windfall if CNG taxis become mandatory.In order to work as a taxi driver in the City of Dallas, a person must have no more than five moving violations and or accidents in the previous 36 months.