Beacuse I would never, ever in a million years put up with a bullshit policy like this:

Before leaving employment, all Parks Canada employees should disclose their intention of future employment and discuss potential conflicts with their supervisor.

Before Leaving Office

Parks Canada employees must disclose, in a Code of Ethics Report to their Human Resources Manager, all firm offers of employment that could place them in a real, apparent or potential conflict of interest situation. They must also immediately disclose the acceptance of any such offer.

http://www.pc.gc.ca/docs/pc/guide/code/page04.aspx

Seriously?