Controlled tests of a manual system call for the deliberate introduction of false or inaccurate documents into the system to determine whether the system or the people operating it will detect the spurious documents. There is considerable difference of opinion among practitioners as to the propriety of such a program.
Required: 

(1) Give three reasons for the use of controlled tests with fictitious documents in a non-EDP system.
(2) Give three reasons against the use of such tests.