If you are searching for criminal history and criminal records through nationwide databases of criminal records you need to know that though federal laws allow you access to this information state legislature does put limitation on availability and access. However there are sources which provide you with some information you can always search through federal prison records and also inmate locator services. There are many websites federal and state which provide criminal information, including sex offender pictures names and locations. You can try to do free criminal history checks by going through many sites. There also many websites with database access who for a fee conduct a search and provide you a report containing the data available based on each states legislature.
But depending on your needs such as an employer or landlord you need fast and reliable resources for your criminal background checks these paid services could provide you with the best results at the shortest time possible. Even if you are a household employee employer you could look into these paid services for reliability and ease and to protect your and your family's safety.
There are many companies in the business of compiling databases with criminal and public record data. They usually charge for providing their data to you either directly or through other online providers. If you have time you could usually search through free access links to gather as much information as possible about any criminal history. You need to identify which method is right for you.