There's nothing to stop you writing cheques, in the same way as there is nothing to stop the bank bouncing them because you don't have cleared funds to back them. You would be charged fees for bouncing cheques and potentially damage your credit history
If you know the original cheque you deposited was going to bounce and you still wrote and issued cheques yourself, then as a previous poster stated, this can be held to be fraud.
Although the money from the cheque is showing in your account, the bank are still entitled to bounce the cheque for a number of days. For example, if you lodged an AIB cheque in UB on Monday, AIB get the cheque on Tuesday, they have until COB on Thursday to bounce the cheque and it could be the following Monday or Tuesday for the unpaid to hit your UB account, Hence why banks say it can take up to 7 days to ckear a cheque, although I believe the money is at least earning interest whilst it is waiting to clear( or at least that is what some banks say)