Systems and methods are described that determine a threshold value for an authorization check, such as an age verification, that is performed at a point of sale or other point of access control where access to a product, service, location, event, or the like, is restricted to individuals who meet an authorization threshold. In embodiments associated with purchases that comprise a variety of items for purchase and a variety of associated age-related authorization thresholds, systems and methods are described for determining an age-related authorization threshold for the purchase as a whole that will authorize the purchase of the items. In embodiments in which a purchaser's authorization is checked with respect to a determined threshold value, a record of the authorization check can be stored and can subsequently be retrieved to verify that an authorization check for the encounter was carried out using the determined threshold value.