How to Check an Applicant's Current Employer
1.Askthe applicant if it would be possible to talk to either his supervisor oranother member of the company who would appropriately comment on hisperformance, and yet not jeopardize his position with the company.
2.Askthe applicant to suggest someone who was associated with him in his currentcompany, but who has since left that company.
3.Conditionthe job offer on the fact that the applicant will receive a satisfactoryreference from his current employer, and check with the employer after theapplicant has tendered his or her resignation.
SOURCE:“Reference Checking—Objectives and Techniques by Richard H. Magee,