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(Sources nicked from Clean Air Club)

Rapid tests/LFTs are very reliable at showing true positives (99%) but not great at showing true negatives – historically the average reliability has been 69%*, but with more recent variants, it's reportedly even lower, around 27%**.

So while you can believe a positive result, you shouldn't rely on a single negative test. Instead, you should repeat the test over several days.

Sources:
* https://www.aafp.org/pubs/afp/issues/2023/0400/cochrane-poc-rapid-antigen-tests-for-diagnosis-of-covid-19.html#:~:text=Evidence%2DBased%20Answer,%2C%2099.2%25%20to%2099.3%25

**https://pubmed.ncbi.nlm.nih.gov/36379401/