AFIAK, they need to certify test kits -(chemical sniffers) train dogs, etc.

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there's a standard that has to be met for the test kit you use to lock someone up.

the target substance need to be standardized just the same.

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NIST Chemistry WebBook, SRD 69

https://webbook.nist.gov/cgi/cbook.cgi?ID=C50362&Mask=200

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Cocaine
Formula: C17H21NO4
Molecular weight: 303.3529
IUPAC Standard InChI: InChI=1S/C17H21NO4/c1-18-12-8-9-13(18)15(17(20)21-2)14(10-12)22-16(19)11-6-4-3-5-7-11/h3-7,12-15H,8-10H2,1-2H3/t12?,13?,14-,15+/m0/s1 Copy
InChI version 1.06
IUPAC Standard InChIKey: ZPUCINDJVBIVPJ-PFSRBDOWSA-N Copy
CAS Registry Number: 50-36-2
Chemical structure: C17H21NO4
This structure is also available as a 2d Mol file
Stereoisomers:
Pseudococaine
Allococaine
Other names: 8-Azabicyclo[3.2.1]octane-2-carboxylic acid, 3-(benzoyloxy)-8-methyl-, methyl ester, [1R-(exo,exo)]-; 1αH,5αH-Tropane-2β-carboxylic acid, 3β-hydroxy-, methyl ester, benzoate (ester); L-Cocaine; Benzoylmethylecgonine; Ecgonine, methyl ester, benzoate (ester); Neurocaine; 2β-Carbomethoxy-3β-benzoyloxytropane; 2β-Tropanecarboxylic acid, 3β-hydroxy-, methyl ester, benzoate (ester); 1-α-H,5-α-H-Tropane-2-β-carboxylic acid, 3-β-hydroxy-, methyl ester, benzoate; Bernice; Bernies; Burese; Cecil; Cholly; Coke; Corine; Ecgonine, methyl ester, benzoate; Eritroxilina; Erytroxylin; Girl; Gold dust; Happy dust; Kokain; Kokan; Kokayeen; Methyl 3-β-hydroxy-1-α-H,5-α-H-tropane-2-β-carboxylate benzoate; Star dust; 2-β-Tropanecarboxylic acid, 3-β-hydroxy-, methyl ester, benzoate; 3-Tropanylbenzoate-2-carboxylic acid methyl ester; Methyl 3β-hydroxy-1αH,5αH-tropane-2β-carboxylate benzoate (ester); 3β-Hydroxy-2β-tropanecarboxylic acid methyl ester, benzoate; 2-Methyl-3β-hydroxy-1αH,5αH-tropane-2β-carboxylate benzoate (ester); (1R,2R,3S,5S)-2-Methoxycarbonyltropan-3-yl benzoate