You don't want anyone's private information on your website. Policies (Custom checks) can help you to identify if they are used. The following example will search for Social Security Numbers. Contact DubBot support if you'd like help customizing this policy for another type of number.
Search for Social Security Numbers on your website
Type of policy: Reg ex
How its set up:
Set policy to “Page contains" the Regular Expression
Add the following:
\d{3}-\d{2}-\d{4}