random check

Unannounced verification procedure

A random check is an inspection or verification conducted without prior notice or predictable pattern.

Security personnel conduct random checks at airports; managers perform random checks on employee work.

The randomness is meant to prevent people from preparing or gaming the system: Drivers are subject to random checks for alcohol.

Often the selection isn't truly random but appears unpredictable to those being checked.

Opposites
predictability

random checkroutine check

Scheduled verification procedure

scheduling

random checkroutine inspection

Scheduled check for compliance

Family

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Known to kids · Used worldwide · Timeless · Everyday, not technical · Rated G