Lcsmrz and Eoin make very good points in their posts. As a BB supervisor I've seen marginal techs makes mistakes as well as the stellar performers. Since this person is employed by your hospital and working in your lab you might want to think about giving the person the best training you can with close observation to make sure they are capable of handing your workload in the BB. My guess would be that HR didn't even ask about any "errors" the person made. At our place, HR just does a cursory interview, over the phone most of the time and if the potential employee is "eligible for employment" at the last place they worked HR usually passes them on to us for interview. We are all human, we all make mistkes, myself included. Everyone deserves a chance but if you are concerned about performance and you have to option to not train the person in BB you could keep them in Chem/Hem. Again, watch the privacy issues. If this person is going to make it they will, if not you'll know right away. Good luck!!