Another limitation is that there are issues with police forces being able to correctly apply these methods due to the time it takes up, which would undermine its effectiveness. For example the process itself can be extremely time consuming due to letting them recall until they are totally finished therefore many prefer to interview them until the have found out the minimum amount of information which is required. Additionally the training to be able to carry it out is also a lengthy process and researchers have found that most have only been able to give a few hours which means they don't have the correct training to deliver it effectively (kebbell and wagstaff)