The Verified InCheck - Level 1 can be conducted by ZDHC approved third-party verifiers. The approved verifiers are listed on the ZDHC Find your Expert website. A supplier can engage any of the listed approved verifiers and confirm the costs and date of the site visit for the Verified InCheck - Level 1. The on-site check takes a minimum of 2-3 hours, depending on the size of the supplier's facility.