When residue containing cannabis or a cannabis derivative is combined with the dry reagent zone on the test card, the reagent will produce a dark red color change.

Depending on the nature of the sample, this color change may occur on the test pen, on the test card, or on both surfaces. For this reason, it is essential that you check both the pen and card for indication of color change.

The color development for a positive result should be rapid and will often be permanent. Depending on how much residue is collected, the intensity of the red color could range from weak to very strong. If you are unsure of whether the color you are seeing is considered a positive result, consult the color reference panel on the test card.

After a few minutes, the color on the test may fade or change, so it is important to collect results as soon as possible. You may also fill out the fields on the Record Card to note the conditions and results of the test.

Since Verifique’s tests rely on a color change, there are a number of factors to consider about the use of the test. The following can result in mistaken readings that are based on human or procedural error, rather than an error with the color chemistry:

  • Improper/non-white lighting used in the test procedure
  • Partial to full color blindness of the operator
  • Highly colored/color-producing samples used in testing (wet or dry paints, dyes, tea leaves, etc.)
  • Highly viscous or thick samples used in testing (candle wax, silicone oil, engineering grease, etc.)

Sample Collection

The Verifique Test Pen will be used to collect your sample. You should use the tip of the pen to dab, swab, or rub the surface that you are testing, depending on the nature of the sample. This process should take up to 10 seconds.

You are aiming to collect as much potential residue as possible, and concentrate it on the tip of your pen. If you are testing a visible residue like oil, plant matter, or crumbs, you should be able to see the residue picked up on the pen’s tip.

For testing vape pens, if possible, you should dab the tip of the pen into the oil well of the cartridge. If you are unable to access the cartridge, you should aim to swab the surfaces with the most potential residue, the mouthpiece and oil cartridge.

For testing edibles, it is advised to swab firmly and in the same spot to ensure you can collect a sample through any external coating (paraffin wax, sugar, etc.).

Conducting the Test

Once you have collected your sample, you will combine it with the reagent printed in the reagent zone of the Verifique Test Card. This is done by dabbing the tip of the test pen across the card’s reagent zone. This process should take no more than 10 seconds.

If a detectable cannabis compound was picked up in your sample, the reagent should produce a vibrant, dark red color. This could happen immediately, or take up to 30 seconds. Be sure to check both the reagent zone and test pen tip for any signs of color development.

If any dark red develops within 30 seconds, the result of the test is positive for cannabis.

If no dark red color develops within 30 seconds, the result of the test is negative for cannabis.