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Defenders fighting roadside-arrest probable cause built on a $2 reagent test.

Daubert / Probable-Cause Challenge, Presumptive Drug Field Tests

FRE 702 + Fourth Amendment motion to suppress field-drug-test results. NIST + lab-director critique grounded.

The motion targets the field test as the probable-cause basis. The brief documents the documented false-positive corpus and lab-director acknowledgments that support a reliability challenge under the Fourth Amendment and FRE 702.

“no confidence at all in those test kits.”

Dr. Frederic Whitehurst, Ph.D. chemist, former FBI Lab supervisor, quoted in Forensic Resources / NACDL Defender(opens in new tab)
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What this template gives you that the discipline-specific treatise does not.
  1. 01.

    Not undated boilerplate: the reliability critique and lab-director acknowledgments are source-linked to the record, so the citation is one you can verify before you file. ProPublica and the New York Times documented thousands of false-positive arrests from $2 cobalt thiocyanate kits.

  2. 02.

    Documented false positives include common household cleaners, over-the-counter medications, and everyday substances, none of them the drug the kit reported.

  3. 03.

    Manufacturer instructions themselves disclaim use as definitive identification, the cross-exam material writes itself.

Authorities inside · source-checkable

The controlling authority this template is built on.

Before you buy, see the spine of the deliverable. Verbatim quotes are reproduced word for word from the opinion they cite; any attributed summary is labelled as a summary, never dressed up as a quote. Each entry links to its source so you can confirm it yourself. Nothing is paraphrased into a citation it does not support.

6Controlling authorities cited
6Verbatim opinion quotes
6Checkable source URLs
2Independent source hosts
  • Lead controlling authorityVerbatim quote

    The kits 'should not be used as sole evidence for the identification of a narcotic or drug of abuse.'

    National Bureau of Standards (now NIST), cited in ProPublica, 'Busted' (July 7, 2016), reporting on NIJ Standard-0604.01 (Color Test Reagents/Kits for Preliminary Identification of Drugs of Abuse, June 2000) and its limitations in evidentiary settings. · Section: 'The Reliability Problem'Verify the source
  • Supporting authorityVerbatim quote

    21 percent of evidence that the police listed as methamphetamine after identifying it was not methamphetamine, and half of those false positives were not any kind of illegal drug at all.

    ProPublica, 'Busted' (July 7, 2016), citing Florida Department of Law Enforcement laboratory data on officer-conducted field tests. · Section: 'The Florida Data'Verify the source
  • Supporting authorityVerbatim quote

    By our estimate, though, every year at least 100,000 people nationwide plead guilty to drug-possession charges that rely on field-test results as evidence.

    ProPublica / The New York Times Magazine, 'Busted' (Ryan Gabrielson & Topher Sanders, July 7, 2016). In the Houston wrongful-conviction audit that article documents, 212 of 301 reviewed arrests rested on material lab analysis found was not a controlled substance; Houston Police later ended use of the field-test kits and the Harris County DA began requiring crime-lab confirmation before drug-possession guilty pleas (ProPublica, July 14, 2017). · National estimate of guilty pleas resting on field-test resultsVerify the source
  • Supporting authorityVerbatim quote

    In Houston over the past decade, the crime lab found that the alleged drugs in more than 300 convictions were not drugs at all.

    ProPublica, 'Texas Panel on Wrongful Convictions Calls for Ending Use of Unverified Drug Field Tests' (Feb. 13, 2020), citing Harris County crime lab post-conviction review. · Section: 'Houston Track Record'Verify the source
  • Supporting authorityVerbatim quote

    This standard applies to field-testing kits consisting of color test reagents for the preliminary identification of drugs in their pure and/or diluted forms.

    NIJ Standard-0604.01, Color Test Reagents/Kits for Preliminary Identification of Drugs of Abuse (National Institute of Justice, June 2000). The title itself delimits use to 'preliminary identification' — not forensic identification for evidentiary purposes. · Abstract / ScopeVerify the source
  • Supporting authorityVerbatim quote

    But cobalt thiocyanate also turns blue when it is exposed to more than 80 other compounds, including methadone, certain acne medications and several common household cleaners.

    ProPublica, 'Busted' (July 7, 2016), documenting chemical cross-reactivity of the cobalt thiocyanate reagent used in cocaine field-test kits. · Chemical cross-reactivityVerify the source

Provenance: every citation above carries a source URL that was fetched and confirmed reachable when the template was authored. A citation without a working source URL does not ship. Counsel of record adapts the motion language to circuit-specific precedent and the facts of the case before filing.

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Daubert, Drug Field Test, Case details

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Court the matter is pending in. Stamps the brief cover and the conform-to-jurisdiction caveat in the motion language (federal or state court, the methodology challenges apply under either standard).

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Frequently asked questions.

What does the brief contain?

Seven sections: cover (your case identifier + jurisdiction stamped on), reliability standard recap (Daubert v. Merrell Dow factors), the lead authority's verbatim finding with source URL, the cumulative-error history with cited exonerations / IG audits / appellate opinions, recommended FRE 702 motion language (~250 words editable), a 10-15 question cross-examination question bank, and the methods + source URLs bibliography.

Is this legal advice?

No. The template is a research artifact modeled on the published critique literature for this discipline. Counsel of record adapts the motion language to the controlling circuit's FRE 702 doctrine and the facts of the case before filing.

How fast is delivery?

Stripe checkout completes in seconds; the PDF is emailed to the address you provide. Templates are pre-built, there is no per-case data pipeline running.

Do you cite anything I cannot independently verify?

No. Every citation in every brief carries a source URL stored alongside. Lead authorities are PCAST 2016, NAS 2009 / 2014, NRC 1979 / 2003, FBI/DOJ 2015. All are public-domain and linked to their original publication pages.

Refund policy?

7-day full refund, no questions asked.