"The quickest and easiest way to do this is to ask the candidate for pay stubs. These should be redacted of any dollar amounts and personal info, but should show company name, candidate name, and pay date. Alternatively, redacted W-2s for any years employed should work. You can also ask to speak with a former supervisor, HR rep, or someone else from the company that might have an idea when the candidate worked there." - Tammi Burnett
"You can try asking for any documentation they may have that would prove employment ie: offer letter, W2, resignation paperwork, termination paperwork, paystub. As a best practice have them redact any information that may go against state or federal law." - Tyler Fisher