In any job I've ever interviewed for, resume and writing samples are submitted by the applicant to HR in advance of interviews. Then it's the responsibility of HR to distribute copies of those documents internally to interviewers. Now it might have been wise of him to carry copies (to compensate for your company's apparent shoddy approach to interviewing). And if he didn't research your company a prep then that's a big strike. Still, if you go into an interview without having first obtained a copy of the applicant's resume that's on you.