> If it comes down to 'he says she says' do you fire someone even though you don't have evidence?
If an employee of yours said they were raped by another employee, would you make them go to the hospital and get a rape kit before believing what they said?
If an employee of yours said they got mugged and lost their laptop, would you demand security camera footage before replacing it?
You should default to trusting your employees. You hired them! They are invested in the company, potentially with equity! Especially in at-will employment agreements, I think this should be much closer to "Management reserves the right to let go of anyone at any time for any reason" than the criminal standard of "beyond a reasonable doubt."