I should believe this?
No one is going to believe you have to monitor consultants' computer activity just to find out when they arrive and leave work. That is like saying I have to go inside your house to verify your address. I wouldn't work for any company that does what you propose. If you want to retain good employees, don't treat them with suspicion. If you and your manager are incapable of implementing any standard time clock system, you shouldn't be in management.
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