Under the Dallas County agencies, database is showing that UT Southwestern shares frequency with Dallas County Hospital District:
Used for Parkland, St. Paul, Childrens Medical Center, Zale Lipsey and UT-Southwestern Police Operations.
Frequency Input License Type Tone Description Mode
453.62500 458.62500 KNDC722 R 025 DCS Police Dispatch FM
453.57500 458.57500 KNDC722 R 025 DCS Police Alternate FM
453.26250 458.26250 WPQA377 R 025 DCS Parkland Police, Psych ER
I have not tried to monitor them