The researchers did not teach test materials themselves to the children. Instead the researchers taught the children how to take the test in two or three strategy sessions lasting about 20 minutes each. The children were much more successful on the follow-up test. And they'll exhibit errors in both languages. When a child has a disorder, you would see an examiner really having to provide a lot of support.
Most speech pathologists take about an hour to do an assessment.
But this could save you a year of providing a service that wasn't necessary in the first place.