I would have a meeting with the employee. We would talk about their performance and figure out where their strengths and weaknesses lye. I would then bring up the problems the company has been having with their performance and discuss ways to improve those things. At this point you can really get a feel for the employee and if they really care or not. Define the actions and take and let them be aware that they will be reviewed for the next 2 weeks to identify their progress and their future position with this company.