A study examined the various laws and practices in six states regarding nonmonetary eligibility for state unemployment insurance programs and assessed the effects of these laws and policies on the states' ability to identify and reject unemployment insurance claimants who fail to meet the requirements. Eligibility for unemployment insurance in all six states was based on two sets of criteria: initial monetary and nonmonetary qualification requirements (which are based on previous employment) and continuing eligibility conditions (which are exhibited through continuing attachment to the labor market). The ability of a given state to deny benefits to ineligible claimants was found to depend on the effectiveness with which the state detects determination issues rather than on the consistency with which its determinations lead to denials. Two important practices contribute to high determination rates. The first is initiation of the determination process on the basis of information from several actors, and the second is an insistence upon obtaining simple factual information from employers on the reason for separation. The severity of penalties affects administrative behavior during the determination process as well as the behavior of potential claimants. Also important are comprehensive and detailed written policies. A broad view should be taken of the types of information that justify inquiry, and the information available to the adjudicator responsible for decision making should be maximized. (MN)