The following substances may interfere with the Alco-Screen™ stick when using samples other than saliva:

Agents that may enhance color development:

  • Peroxides
  • Strong Oxidizers

Agents that may inhibit color development:
Reducing Agents:

  • Ascorbic acid
  • Tannic Acid
  • Pyrogallol
  • Mercaptans and tosylates
  • Bilirubin
  • L-dopa
  • L-methyldopa
  • Methampyrone

The above-named substances do not normally appear in sufficient quantity in saliva to interfere with the test. However, care must be taken that they are not introduced into the mouth during the 15 minute period preceding the test.