[waterlesscloud]

Let me ask you something-

What will you have achieved after you "hammer" them on that technology?

Will you genuinely be closer to assessing whether that candidate can do the job you need done?

[cafard]

I am not a hammerer. Yet once when I saw PL/SQL on a candidate's resume, I did start asking some questions--not stuff like "explain PRAGMA WNDS" but "tell me a bit about how you've done xyz in PL/SQL" and promptly hit a blank look.

I think that it is reasonable to ask questions about what is on a resume.