Accessing any computer system without authorization is that part that is generally illegal, "Hacking" itself isn't illegal, and while accessing your bosses comp

Accessing any computer system without authorization is that part that is generally illegal, "Hacking" itself isn't illegal, and while accessing your bosses computer while it's unlocked isn't "hacking" it's still illegal. However most countries can authorize law enforcement to access the device under various conditions (for example a warrant). So while the owner of the device doesn't authorize accessing the device, the law allows the police to access it.