Status: OUT
Multiple systems omit input validation entirely at internal module boundaries — the stock exchange accepts any order fields without checking quantity or price, and proximity search accepts any coordinates without range validation — reflecting a convention of trusting callers within the module perimeter rather than validating defensively.
Both base beliefs describe missing validation at internal boundaries, forming a systematic trust-the-caller convention
Depends on (SL): stock-exchange-no-input-validation, proximity-no-coordinate-validation