Fentanyl Test Strips: Why Are They Illegal?

Fentanyl test strips (FTS) are a form of drug-checking technology that can check drugs for the presence of fentanyl, a synthetic opioid involved in approximately 69% of all U.S. drug overdose deaths in 2023.

Provisional data from the CDC indicates there were an estimated 80,391 drug overdose deaths in the United States in 2024, a decrease of 26.9% from the 110,037 deaths estimated in 2023. While this decline is encouraging, opioid overdose deaths remain a leading cause of accidental death in the U.S., with fentanyl involved in the majority of cases.

As most states have now legalized or decriminalized fentanyl test strips, access to this potentially life-saving tool has expanded significantly, though legal barriers remain in a handful of states.

Why Are Fentanyl Testing Strips Considered Paraphernalia?

Paraphernalia is generally defined as something that is used for a particular activity, such as substance use.

But the reason why testing equipment, such as FTS, is considered a form of paraphernalia largely depends on how it’s defined according to state law.

And some states, like Texas, have identical or near-identical language within their own drug misuse and prevention statutes.

What Can Fentanyl Testing Strips Do?

Essentially, these strips can test drugs for the presence of fentanyl. Strips manufactured by BTNX Inc, a Canadian biotech company, can detect fentanyl and a comprehensive list of analogs.

They work similarly to an at-home pregnancy test and require that a person dissolve the substance they plan to ingest in water. Strips can then be placed in this water and tested for fentanyl.

With fentanyl contamination driving a surge in opioid overdose deaths, from contaminated street drugs like methamphetamine and heroin, identifying fentanyl in a substance can help reduce the risk of overdose.

Fentanyl is about 50 times more potent than heroin. Even a small amount can quickly lead to overdose, especially when mixed with other drugs or if taken by someone with low tolerance.

Important: Standard fentanyl test strips do not detect xylazine, a veterinary sedative now commonly mixed with fentanyl in the illicit drug supply. Xylazine overdose does not respond to naloxone. Separate xylazine test strips are available through some harm reduction programs. Contact a local harm reduction organization to ask about xylazine testing options in your area.

Why Fentanyl Test Strips Remain Controversial

Fentanyl test strips are widely described as a harm reduction method or harm reduction strategy, meaning they are a tool that can help reduce or mitigate harm posed by drug use.

Other harm reduction strategies include the distribution of naloxone—or Narcan, an opioid overdose reversal drug—as well as syringe services programs and overdose prevention centers.

Yet, while there’s evidence that shows certain harm reduction methods can help prevent the transmission of infectious diseases and even save lives, not everyone is in agreement that they should be uplifted or decriminalized.

Who Opposes Fentanyl Test Strips?

Opponents to drug checking technologies and other harm reduction methods say that this approach encourages illicit drug use, as it does not require that a person stop using drugs.

That is, opponents argue that uplifting harm reduction strategies would worsen, rather than solve, widespread substance use disorder.

However, this argument is contrary to the overwhelming evidence that demonstrates this is not the case.

In the case of FTS, research shows this drug checking technology is safe, easy to use, and can be effectively utilized as a non-invasive, non-punitive tool for drug overdose prevention.

Who Supports Fentanyl Test Strips?

Although it wasn’t always so, the use of FTS as a tool for overdose prevention is now backed by federal agencies, as well as many public health experts, and other health organizations.

Agencies and organizations that now support the use of FTS for specific purposes include:

• the Substance Abuse and Mental Health Services Administration (SAMHSA)
• the U.S. National Institute on Drug Abuse (NIDA)
• the U.S. Centers for Disease Control and Prevention (CDC)
• and other drug policy, healthcare, and advocacy organizations

Since 2021, federal funding has been available to purchase FTS for clinical, research, and public health purposes. Federal support for FTS as a harm reduction tool has continued to expand alongside widespread state legalization efforts.

Which States Have Legalized Fentanyl Test Strips?

The legal status of fentanyl test strips has changed dramatically in recent years. As of 2025, 45 states plus Washington, D.C. have enacted laws or policies that permit the possession, use, or distribution of FTS without drug paraphernalia penalties, a complete reversal from just a few years ago.

Only five jurisdictions continue to broadly ban fentanyl test strips: Idaho, Indiana, Iowa, North Dakota, and Texas.

Even within states that permit FTS, specific rules vary. Some states allow possession but restrict sale; others limit legal distribution to licensed harm reduction programs or syringe services programs. Checking your state’s current law or contacting a local harm reduction organization is the best way to confirm what applies in your area.

For the most current state-by-state information, visit the Legislative Analysis and Public Policy Association (LAPPA).

Potential Benefits Of Fentanyl Test Strips

Tens of thousands of people die due to drug overdose each year, as a result of excessive fentanyl use or the use of fentanyl mixed with other drugs.

Illicit drugs like meth, for instance, may contain traces of fentanyl that are sold to people without their knowledge; that is, they may not be aware that the drugs they bought contain fentanyl.

Testing strips, therefore, can help inform and empower people who use drugs to be aware of the presence of fentanyl and fentanyl analogues in their drug supply.

The strips are also inexpensive, at about $1 per strip.

Fentanyl Test Strips May Help Prevent Fentanyl Overdose

Furthermore, there’s research that shows that people who use these rapid testing strips, and get a positive test result, are more likely to use harm reduction strategies that can prevent overdose.

This includes actions such as:

• throwing out their batch
• making sure they’re not using drugs alone
• using their drugs more slowly
• using less of the drug containing fentanyl

While this doesn’t by itself stop a person from using drugs, it can prevent fatal overdose—and the devastation that that can leave for loved ones in its wake.

When acquired through a harm reduction program, access to FTS can also connect people with drug addiction to addiction treatment or social services.

Getting Help For Substance Use Disorder

Millions of people in the United States struggle with some form of substance use disorder. Without seeking help, this problem can be debilitating and life-threatening.

For more information about drug addiction treatment and how to find treatment options near you, call our helpline today to connect with a trained addiction specialist.

Written by the Addiction Resource Editorial Staff