From TDCJ https://tdcj.texas.gov/news/inspect_2_protect.html

"Searches

In an effort to increase staff and offender safety, the following procedures will be implemented:

Certified narcotic canines will be used strategically to detect narcotics and synthetic marijuana on visitors entering facilities. Searches on staff have already been implemented.

The individual the canine alerts on will not be allowed to visit any offender that visitation cycle (visitation cycle – that weekend). If a certified narcotic canine alerts on a child visitor, all adult visitors accompanying the child will not be allowed to visit any offender that visitation cycle.

Incidents of alerts will be documented. A second alert, regardless of the time frame for an individual, will result in removal from any offender’s visitation list. "