Apparently, investigating ears can be helpful when attempting to indentify someone. I didn’t read all these, but there are many papers, books, articles, and studies on the topic. Feel free to discuss.
https://www2.le.ac.uk/departments/emfpu/students/bsc/aa-abstract.pdf
http://www.ncbi.nlm.nih.gov/pubmed/12570218
Just Google for more.