You do this by turning the tables and asking questions to the interviewer. Here are some questions the recruiter recommended I take along to my interviews. Obviously you need to decide which of these questions fit into the interview. This list should not be used as a blind checklist. Also, you may need to tailor these questions to fit the formality of the interview.
Some interviews are like conversations.
Other interviews are very rigid and formal. Just pay attention and do what seems appropriate. Listen to the answers and see if you can distinguish the bluster from the facts. It's an interesting experience to have the interviewer squirm. Do your best to be courageous in asking questions.