Top officials in the state Taxation and Revenue Department may have improperly given preferential treatment to a New Mexico taxpayer, according to State Auditor Tim Keller’s Office. Update: A letter from Keller to Gov. Susana Martinez names Tax and Revenue Department Secretary Demesia Padilla as part of the investigation. Our report is here. The post continues as originally written below. The allegations came from a fraud hotline call to Keller’s office in February, along with an audio recording of senior Taxation Department officials.