How to prevent the creation of user stored procedure name started with SP_ in SQL Server 2000

Question

We have a SQL Server 2000 database that has a number of databases

We need to ensure that the users are unable to create stored procedure with a name that starts with SP_.

What can be done in SQL Server 2000 to prevent it?

I do understand that this can be achieved in SQL Server 2005+ versions using a stored procedure facet.