I would like to push the matter further.
When applicants do the research work in order to obtain all the documents they have to submit, they communicate with courts and police stations. They are the ones doing the work because it would be an extremely onerous, complicated and lengthy task if the department had to do it instead. I fully understand that. So applicants have to ask police stations or courts to send them the information. However, those places are not always in the city where an applicant lives. To facilitate the process, they receive documents by email or the post.
How can you guarantee that the documents submitted to you are valid?