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ASTM E1968-19

ASTM E1968-19

Standard Practice for Microcrystal Testing in Forensic Analysis for Cocaine

2020-01-07 /Active
Significance and Use:

5.1 This technique involves a chemical-precipitation reaction between cocaine and the precipitating reagent. The habit and the aggregation of the crystals formed could be used to distinguish cocaine from other drugs (6).

5.2 This technique can be utilized on cocaine present in either the salt or free base form.

5.3 This technique does not distinguish between the salt and free base forms.


1.1 This practice describes procedures applicable to the analysis of cocaine using multiple microcrystal tests (1-6).2

1.2 These procedures are applicable to cocaine, which is present in solid form or an injectable liquid form. They are not typically applicable to the analysis of cocaine in biological samples.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 These procedures could generate observations indicating a positive test for cocaine or its enantiomers which could be incorporated into the analytical scheme as defined by the laboratory.

1.5 This standard cannot replace knowledge, skills, or abilities acquired through appropriate education, training, and experience (see Practice E2326) and is to be used in conjunction with professional judgment by individuals with such discipline-specific knowledge, skills, and abilities.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

analysis; cocaine; microcrystalline testing;
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