Optical Detection of the Weak Force

This link examines using optical rotation to detect the presence of the Weak force. The Weak force is known to not conserve parity and is predicted to rotate the plane of polarized light in certain heavy element vapors:
http://www.phys.washington.edu/~fortson/cronin/GroupOR.html

If this works it could be a relatively simple "table top" method to observe fundamental parity non conservation (PNC) in nature; something that otherwise requires very elaborate setups.