21.   He said Mexican railroads need U.S. technology, such as computerized tracking systems.

22.   Hoping to flush out sexual predators, Sen. Phil Gramm of Texas introduced legislation Thursday to establish a national tracking system for convicted sex offenders.

23.   Hospital staffers are required to keep dangerous drugs under lock and key, and have elaborate tracking systems to prevent theft of medications, Wade said.

24.   If such a system is misused, this information could create a kind of digital tracking system.

25.   In New Mexico last year, the state pharmacy board repealed regulations needed to operate a tracking system after complaints by pharmacists and doctors who treat pain.

26.   It also calls for states to continue anonymous HIV testing for people who refuse to be part of the tracking system.

27.   It is natural, they said, to try to improve the potency of the tracking systems by integrating data from online and offline sources.

28.   It also provides a tracking system so users can compare their heart rate and cholesterol over time.

29.   It still had concerns, it said, but would no longer oppose a tracking system in the interest of national unity.

30.   Lawmakers may want to consider taxing foreign students to pay for a tracking system, he said.