The president has called on Congress to require background checks of people who buy weapons at gun shows.
She plans to introduce a bill later this year that could require background checks of the men who use the services.
Many do not require adequate checks of their volunteers leaving children open to abuse.
Applicants will be informed by the online application system if they require medical checks.
Some states, such as California, require criminal background checks, while other states do not.
Over all, the new law strengthened the application process by requiring deeper background checks.
Last year, he supported a measure to require criminal background checks of people who make purchases at gun shows.
Washington State requires such background checks, as nursing aides are state-licensed.
These valves are complex, requiring certified installation and annual checks.
Now state law requires criminal background checks and fingerprinting for public school employees hired after July 2001.