can texas law enforcement use all blue lights ?

Question for current law enforcement fire or emts who know the current 2021 laws.....i Was visiting Louisiana near the state line not to long ago and seen the DPS, LSP and some unmarked cars with both Louisiana and texas plates that looked like they had all blues working a scene on the interstate, I know Louisiana runs all blues because its a southern state and usually texas highway patrol runs red/blues on marked cars with there lightbars (I assume because its considered a western state....dont make sense because its straight in the bottom middle of the country but thats a debate for another time) so.... can law enforcement like sheriffs or maybe texas rangers who'd be in unmarked units use just blue? ......(also heard texas rangers manly use pickup trucks like chuck norris did on walker texas ranger....who used blue in his headlights and and red in the taillights....wonder if Chuck norris got the lights down right?)