SCCM 2007 query to find Scheduled tasks setup on a client.

Hello all,

I have been asked by senior management at the school where i work to automate the shutdown of PCs at a specific time each night.
So I created a batch script that sets up a scheduled task on the clients to do this, and rolled it out via software distribution.

How would I go about creating a query to check which machines do not have the scheduled task?