Full Queries A full query is required when hiring a driver. Full queries allow employers to see detailed information about any FMCSA drug and alcohol violations in a driver’s Clearinghouse record. Limited Queries A limited query is required at least annually on all drivers. Limited queries allow employers to determine if an individual driver’s Clearinghouse record has any information about resolved or unresolved drug and alcohol program violations. However, they do not release any specific violation information. If a limited query shows the driver has unresolved violations, the employer will then need to run a full query to access the details of the violation(s).