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| TITLE 37 | PUBLIC SAFETY AND CORRECTIONS |
| PART 1 | TEXAS DEPARTMENT OF PUBLIC SAFETY |
| CHAPTER 4 | COMMERCIAL VEHICLE REGULATIONS AND ENFORCEMENT PROCEDURES |
| SUBCHAPTER B | REGULATIONS GOVERNING TRANSPORTATION SAFETY |
| RULE §4.21 | Report of Valid Positive Result on Alcohol and Drug Test |
| Effective through: 03-31-2020 |
| Effective through: 02-24-2010 |
| Effective through: 08-15-2007 |
| Effective through: 04-29-2007 |
| Effective through: 09-30-2006 |
| Effective through: 05-29-2006 |