What it is
Rescinded offers rise after background checks, drug tests, reference calls, and post-signing changes in budget. The offer letter, the written terms, and your reliance on it drive the claim, and the leverage file is the sequence of written facts.
What to do about it: Do not give notice until the written offer, the start date, and the terms are in hand. Collect the offer letter, the background consent, and the withdrawal notice in writing.
Plain-language description of US practice, not legal, tax, or financial advice. The paired guide carries the citations, dates, and thresholds; the state pages carry the local windows.