Two possible ways:
1) Add their domain account to the laptops local administrator
group. They will be a laptop admin at all times. When they logon
to the domain account at home they will be notified the system
is using a cached profile because the network was not available.
2) Have them log on to the laptop using a domain account at the
office and they will not be an admin. When they are at home
have them log on to the laptop using a local account that has
admin abilities. When they log on there are 3 boxes: Name,
Password, and the last box is where they would choose the
domain or local machine.
A bigger issue is should they be logging into the LAN with their
home laptop. People tend to be less security aware than
business' do. If the user gets a personal email with a virus and
becomes infected they then bring that virus into the office
bypassing any email scans and firewall scans etc. It is now on
your network. While you may have protection on the
workstations, do you want it to get that far?
I know that based on the user, and reason, you may not be able
to prevent it, but you should be aware of the risks involved.
Good Luck,
razz