So, how would this bill prevent Homolka from receiving a pardon ... assuming she were applying for one in the first place?
How did anyone know Grahame James would apply for a pardon... and then receive one in 2007? Bill C-23 does include legislation to block a pardon for KH. The only problem is, it's Tories and Liberals in coalition government. They are notorious for foot-dragging and not getting anything done. Bill C-23 would never be passed and enacted before KH possibly applies for a pardon.
Remember now, if she were to ask for a pardon at all it would be asking for a pardon for manslaughter, and not the heinous crime of sadistic murder.
This is true, it might even be more likely for her to receive a pardon for the lesser charge of manslaughter, even though videotaped evidence produced after the trial showed KH to have been more an active participant in the sadistic murders than she revealed previously.