Texas Child Protective Services (officially the Department of Family and Protective Services, or DFPS) uses six types of drug tests: instant oral swabs, lab-confirmed oral swabs, urinalysis, head hair strand tests, body hair strand tests, and nail tests. The specific test a caseworker orders depends on how far back they need to look and what substances they suspect. Here’s what each one involves and what it can detect.
Oral Swab Tests
Oral swabs are the quickest option and come in two forms. The instant-read version gives results on the spot, but those results are not lab-confirmed and cannot be used as evidence in court. The lab-confirmed oral swab tests for the same substances but is sent to a laboratory for verification, making it admissible in legal proceedings.
Both versions detect marijuana, cocaine, PCP, amphetamines, methamphetamines, and non-synthetic opioids. The major limitation is the detection window: oral swabs only pick up use within the last 24 to 36 hours. This makes them useful when a caseworker suspects a parent is currently under the influence, but not for establishing a pattern of use over time.
Urinalysis
Urinalysis is the broadest standard test Texas CPS uses. It screens for a wider range of substances than any other option on the list: marijuana, cocaine, PCP, amphetamines, methamphetamines, opioids (including synthetic types), benzodiazepines, methadone, barbiturates, methaqualone, and propoxyphene. That’s essentially a full panel covering street drugs, prescription sedatives, and pain medications.
The standard detection window is 3 to 5 days, but that number can stretch significantly depending on the substance and how often it’s been used. Marijuana is the most common example. Someone who uses it regularly or in large amounts can test positive in urine well beyond the typical five-day window. Long-term prescription medication use can also extend detection times.
Hair Strand Tests
Hair testing is where the detection window gets much longer, and Texas CPS uses two variations. A head hair strand test covers the last 90 days of use. A body hair strand test, taken from the arm, leg, or chest, can look back over the past year because body hair grows more slowly and retains drug metabolites longer.
Both types detect marijuana, cocaine, PCP, amphetamines, methamphetamines, and non-synthetic opioids. One notable gap: DFPS hair strand tests do not screen for barbiturates or benzodiazepines. If those substances are a concern, the caseworker would need to rely on urinalysis instead.
Hair tests are typically used when CPS wants to establish whether someone has a longer history of drug use, not just recent activity. They’re common in cases where a parent may have stopped using temporarily to pass a urine test but has a broader pattern the agency wants to document.
Nail Tests
Nail testing has the longest detection window of any method Texas CPS uses, covering the past 6 to 12 months. Fingernails and toenails absorb drug metabolites as they grow, creating a record of substance exposure over a much longer period than hair or urine. This test is less commonly ordered but serves as an option when the agency needs an extended look back, particularly in cases involving prolonged neglect or when other test types aren’t feasible.
When CPS Can Request a Test
A caseworker can request a drug test when they have credible evidence that a parent or caregiver is using substances and that the use threatens a child’s safety. Tests may also be ordered to confirm someone is participating in substance use disorder treatment or maintaining long-term recovery. Courts can independently order drug testing as well, and a court order requiring or prohibiting a test overrides standard DFPS policy.
The key legal threshold is “cause to believe, based on credible evidence.” This could come from a report to the abuse hotline, observations during a home visit, statements from the child, or other information gathered during an investigation. CPS does not test every parent involved in a case as a matter of routine.
Which Substances Each Test Covers
- Oral swabs (both types): Marijuana, cocaine, PCP, amphetamines, methamphetamines, non-synthetic opioids
- Urinalysis: All of the above, plus synthetic opioids, benzodiazepines, methadone, barbiturates, methaqualone, propoxyphene
- Hair strand tests: Marijuana, cocaine, PCP, amphetamines, methamphetamines, non-synthetic opioids (no benzodiazepines or barbiturates)
- Nail tests: Specific panel not listed in DFPS guidance, but covers a 6 to 12 month window
Urinalysis is the only test type that screens for benzodiazepines (drugs like Xanax or Valium), methadone, and barbiturates. If you’re prescribed any of these medications, having documentation from your prescribing doctor is important because a positive result for a legitimately prescribed substance is handled differently than one indicating illicit use.
Who Performs the Testing
Texas DFPS contracts with outside laboratories rather than running tests in-house. The agency’s primary testing contract, worth over $25 million, is with Texas Alcohol and Drug Testing Service and runs through early 2026. A smaller contract with Agileyx Labs Corp supplements that capacity. Caseworkers coordinate the test, but sample collection and analysis happen through these contracted vendors at designated collection sites.
Detection Windows at a Glance
- Oral swab: 24 to 36 hours
- Urinalysis: 3 to 5 days (longer for heavy or chronic use)
- Head hair strand: Up to 90 days
- Body hair strand: Up to 1 year
- Nail test: 6 to 12 months
The test a caseworker chooses sends a signal about what they’re looking for. An oral swab suggests concern about current impairment. Urinalysis points to recent use within the past week. Hair or nail testing means the agency is trying to build a picture of sustained substance use over months, which typically comes into play during more serious investigations or when custody decisions are on the table.