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Australian Drug Frequently Asked Questions

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Q1: Do Drug Alert Kits have a cut off level for testing?
Yes they do. The table below shows the cut off level for each of the drugs they test for. These cut off levels are based on the standard specifications set for substance abuse test kits. Drug Alert kits do not use a zero level, as the possibility of obtaining a false positive result would be increased.

Test
Cut-off
Marijuana THC
50 ng/mL
Cocaine COC
300 ng/mL
Opiates OPI
2,000 ng/mL
Amphetamine AMP
1,000 ng/mL
Methamphetamine MET
1,000 ng/mL
Methylenedioxymethamphetamine MDMA
500 ng/mL
Tricyclic TCA
1000 ng/mL
Barbiturates BAR
300 ng/mL
Benzodiazepines BZO
300 ng/mL
Methadone MTD
300 ng/mL

Q2: How can I be sure the test is working correctly?
Each kit has a control line which is indicated by a C. When a red line appears next to the C it is your verification that the kit has worked correctly. It will appear, be it a positive or negative result. If the line next to the C does not appear then the result is invalid.

Q3: After taking drugs how long will they stay in my system and the kits pick up the presence of a drug?
There are a number of factors which have to be taken into account. These include:

  • The metabolism of the person being tested
  • The type of drug consumed. As an example, marijuana can stay in the system for a month or more
  • The amount and frequency that a drug is consumed

The table below will serve as a general guide:

Test
Time
Marijuana THC
up to 40 days plus
Cocaine COC
2 - 4 days
Opiates OPI
2 - 3 days
Amphetamine AMP
2 - 4 days
Methamphetamine MET
2 - 4 days
Methylenedioxymethamphetamine MDMA
2 - 4 days
Tricyclic TCA
2 - 7 days
Barbiturates BAR
1 - 3 days
Benzodiazepines BZO
1 - 4 days
Methadone MTD
1 - 3 days

Q4: If the line is a lighter shade then the control line does it indicate a lower level of the drug?
Any line next to the C is considered a positive result. Just because it may be lighter does not indicate a lower drug level. Factors such as the pH or protein levels in the urine can affect the intensity of the colour.