Article: These tests are more sensitive than a urine test, but they are also meant to reflect current impairment. Blood and saliva tests are most often administered when you are suspected of using on the job or if you were involved in a car accident. Keep in mind that there is very little you can do in the event that you have to go for a blood test right away. The more saliva you can generate before a mouth swab test, the better! Eat a meal or a snack, drink a few cups of water, and swish with mouthwash or more water if you don't have mouthwash on hand. This will help to get the THC out of your saliva so it won't show up on a mouth swab test. These types of shampoos may help to reduce the amount of detectable drugs on your hair follicles. If you have some warning before the test, pick up a bottle of anti-dandruff or clarifying shampoo and wash your hair with it 2 to 3 times on the day of your test. Keep in mind that this is not foolproof. Hair follicle tests are meant to show whether you have been using substances over the last few months. If you have, then you might still fail a hair follicle test using this strategy.
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Avoid using for at least 4 hours leading up to a saliva or blood test. Eat, drink water, and use mouthwash before taking a saliva test. Shampoo with anti-dandruff or clarifying shampoo before a hair test.