If your sales department has trouble qualifying leads quickly, then have them all fill out a BANT form for each lead. Have four columns titled Budget, Authority, Need, and Time. For each lead they talk to, have them put a check mark in the columns that are qualified, and an "X" in the column that disqualified them (if any). This will cause a mental shift in the sales team, having them hunt for sales qualifications when they get on the phone, instead of just having conversations.