Why it’s unlikely to work
Again, there’s no evidence to suggest that drinking vinegar will help your body to quickly cleanse itself of THC. Even if it were to somehow work, your urine sample would likely raise some eyebrows.
Most ACV “cleanses” designed to help you avoid a positive result instruct you to consume at least a gallon of water in the hours leading up to the test. This results in noticeably diluted urine. In some cases, providing diluted urine could cause you to automatically fail the test. In others, you’ll be asked to provide another sample, often under supervision.
As for adding ACV to your urine sample, this is also likely to raise a red flag. Drug-testing facilities are quite familiar with this method and test the pH levels of samples to ensure that they’re within a normal range. The typical pH of a valid urine sample ranges from 4.5 to 8.0, while the pH of apple cider vinegar is usually around 2.0 to 3.0.
Keep in mind that samples are typically also tested for: