Your issue seems to be "How do I prevent redundant module loads" rather than "How do I detect unused modules". If that is the case then don't worry about it. Perl only loads the module once so the "extra" use statements do not represent a significant processing hit. They do however provide useful documentation - they indicate that the code requires those modules. So long as the "extra" use statements aren't causing trouble due to module load order issues or some such, leave them be!