Many people also criticize the welfare system for being too complex and costly to administer. Each program has its own eligibility requirements and ways of calculating benefits, and these rules vary from state to state. Public officials collect detailed information about applicants to determine their eligibility for benefits. This process is time-consuming and costly. Some people cheat the system by not reporting all the income they earn. But suppliers of services to welfare recipients account for most of the fraud in welfare. For example physicians. They make up false bills and get overpaid.