An internal auditor is conducting a preliminary survey of the investments area, and sends an internal control questionnaire to the management of the function. (An extract of the survey is provided below).

1. Are there any restrictions for any company's investments?

2. Are there any written policies and procedures that document the flow of investment processing?

3. Are investment purchases recorded in the general ledger on the date traded?

4. Is the documentation easily accessible to an persons who need in to perform their job?

Which of the following is a drawback of testing methods like this?