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Addition of chloroform, results in a blue organic layer for both cocaine hydrochloride and cocaine base. Diphenhydramine and lidocaine also give blue organic layers. These compounds are known false positives for cocaine. Lidocaine is commonly used to adulterate or mimic cocaine due to its local anaesthetic effect.
The shade of brown shown by the chloroform is proportional to the cocaine content. This test is not cross sensitive to heroin, methamphetamine, benzocaine, procaine and a number of other drugs but other chemicals could cause false positives. [5]
JSO stopped using cocaine field tests Wednesday after finding they generate false-positives for common over-the-counter medications.
Combining dextromethorphan with other substances can compound risks. Central nervous system (CNS) stimulants such as amphetamine and/or cocaine can cause a dangerous rise in blood pressure and heart rate. CNS depressants such as alcohol will have a combined depressant effect, which can cause a decreased respiratory rate.
Levamisole has become a common additive to illicit cocaine. It is thought to intensify the "high" by releasing dopamine in the brain, acts as a bulking agent, and is a difficult adulterant to recognize. Potential risks of levamisole-laced cocaine include neutropenia, agranulocytosis, arthralgias, retiform purpura, skin necrosis, and fever.
A drug test on the child came back positive for cocaine. Due to this positive test, the remaining six children were tested. Overall, four of the seven had cocaine or cocaine metabolites in their ...
The substances must be specific. It is the most common drug screening technique. Using the targeted drug the test will tell you if it is positive or negative to that drug. There can be 4 results when taking the test. Those results can be a true-positive, a false-negative, a false-positive, and a true-negative. [14]
The test can easily generate false positives for common substances and must be confirmed with a laboratory test. [155] [156] Approximate cocaine purity can be determined using 1 mL 2% cupric sulfate pentahydrate in dilute HCl, 1 mL 2% potassium thiocyanate and 2 mL of chloroform. The shade of brown shown by the chloroform is proportional to the ...