First, to provide care, BLS, EMT-B, ILS or ALS in TX you must have medical direction. Second, all first responder and stand-by organizations must be licensed through TDSHS. Third, ANY vehicle that is used for medical stand-by or response must be licensed through TDSHS (this includes POV's). Most POV's are covered under your first responder organizations license. All vehicles (including POV's) must have a TDSHS BLS to MICU capable license or a copy of your FRO's license in it at all times.
While there are MANY organizations out of compliance this does not give ANYONE the right to provide care whenever or wherever they want without regards to regulations and/or medical direction.