The Carlson Company is a DNA diagnostics center that provides DNA testing services worldwide. Get faster drug test results with our certified testing lab today! Visine in food or water testing involves analysis of food or liquid Poison detection samples for the presence of dangerous levels of: Cyanides, Azides, Sulfides, Chromates, Lead, Mercury, Cadmium, Thallium and Arsenic-containing compounds require 1 to 7 grams of sample are required, depending on the food tested. Get to know about the latest techniques that use for various types of tests.