Legal to own? That one's simple. Sure it's legal to own one in Texas.
Legal to use? That one's not quite so simple. If you're a licensed ham and using it on ham frequencies than sure you can own and use the radio all you wish (following ham rules, of course). If you have a license for Part-90 (business band or public safety operation) and have it programmed per your license than again there should be no issues using the radio.
If you work for a company that has a Part-90 license and you want to program your personal radio and use it under their license, you may or may not have issues. The key phrase is "their license". You'll need their permission (for your protection get this in writing and from someone that's authorized to grant this permission) and follow their rules on how (and where) you can use your radio on their license. You may also need to have their people program the radio to have it done correctly according to their license restrictions and company policies. Just doing it on your own may cost you your job or worse.
If you just want that cool Motorola radio to work as a scanner, basically don't do it, it'll be much more trouble than it's worth. Can one be programmed for receive only use? Yes, but it's not simple, not "follow these instructions and you'll be fine", and definitely not "any radio shop will program it for you". Make a single error programming it and chances are very good you'll be illegally transmitting and in violation of FCC rules and perhaps even local, state, or federal laws. If it transmits (even a little), the system will probably notice and they could send a kill code to your radio and turn that nice expensive "cool scanner" into a nice expensive inoperative paperweight.