[wolfcreek]

“If Utah and Arizona authorities had been doing their jobs during the past 50 years, this cancer would not have been able to spread into Texas in the first place.”

I agree. In light of this prior criminal activity, is it legally possible for a state, such as Texas, to prevent cults or other undesirables from buying property within said state?

[Colofornian]

I agree. In light of this prior criminal activity, is it legally possible for a state, such as Texas, to prevent cults or other undesirables from buying property within said state?

No. It would be "unAmerican" (you'd have to deny the Mormons, the JWs, Scientologists, Moonies from owning property...If you did that, we wouldn't exactly be the "land of liberty," now would we?)