In this July 10, 2015, file frame from dashcam video provided by the Texas Department of Public Safety, Trooper Brian Encinia arrests Sandra Bland after she became combative during a routine traffic stop in Waller County, Texas. (Texas Department of Public Safety via AP, File)
A Texas Department of Public Safety helicopter prepares to take off to patrol along the Rio Grande, Thursday, July 24, 2014, in Mission, Texas. Texas is spending $1.3 million a week for a bigger DPS presence along the border. (AP Photo/Eric Gay, Pool)
In this Sunday, May 11, 2014 photo provided by the Texas Department of Public Safety, a wildfire burns near Fritch, Texas. The wildfire has led to evacuations and road closures and has destroyed dozens of homes. (AP Photo/Texas Department of Public Safety, Chris Ray)
In this Sunday, May 11, 2014 photo provided by the Texas Department of Public Safety, a wildfire burns near Fritch, Texas. The wildfire has led to evacuations and road closures and has destroyed dozens of homes. (AP Photo/Texas Department of Public Safety, Chris Ray)
In this Sunday, May 11, 2014 photo provided by the Texas Department of Public Safety, a wildfire burns near Fritch, Texas. The wildfire has led to evacuations and road closures and has destroyed dozens of homes. (AP Photo/Texas Department of Public Safety, Chris Ray)
In this Sunday, May 11, 2014 photo provided by the Texas Department of Public Safety, a wildfire burns near Fritch, Texas. The wildfire has led to evacuations and road closures and has destroyed dozens of homes. (AP Photo/Texas Department of Public Safety, Chris Ray)
This undated image provided by the Texas Department of Public Safety shows Army Spc. Ivan Lopez. Authorities said Lopez killed three people and wounded 16 others in a shooting at Fort Hood, Texas, on Wednesday, April 2, 2014, before killing himself. Investigators believe his unstable mental health contributed to the rampage. (AP Photo/Texas Department of Public Safety)
This undated image provided by the Texas Department of Public Safety shows Army Spc. Ivan Lopez. Authorities said Lopez killed three people and wounded 16 others in a shooting at Fort Hood, Texas, on Wednesday, April 2, 2014, before killing himself. Investigators believe his unstable mental health contributed to the rampage. (AP Photo/Texas Department of Public Safety)
This handout photo provided by the Texas Department of Public Safety shows Sandy Thuy Le. On Monday, March 17, 2014, Le became the third person to die after being struck by a suspected drunken driver in Austin last week during the South By Southwest festival Austin police spokeswoman Veneza Bremner said.(AP Photo/Texas Department of Public Safety )