Driver identification
In the administrative fine context, driver identification is the most frequent case group. The typical case is not the crystal-clear one, but the constellation in which a measurement image does not simply speak for itself. The question then arises whether facial regions, the ear region, the hairline, chin contour, or other visible structures are available in sufficient quality and whether suitable comparison images exist.
In practice, even before the actual expert report, the question is often whether a full instruction is worthwhile at all. Especially where the angle of view is very unfavourable or there is substantial occlusion, it may initially be possible only to review image suitability.
The focus here is on case-related questions with a clear evidential question and immediate relevance to the proceedings. Driver identification in particular shows that it is not the crystal-clear case, but the methodologically borderline constellation, that makes expert examination necessary. Typical questions are whether the depicted person is identical with a named comparison person, which features speak for or against identity, whether the image quality is sufficient for a full assessment, whether additional comparison images are required, or whether only a preliminary review is possible at first.
Criminal matters and other image sources
In criminal matters, the starting position is often more heterogeneous. Image material may derive from video surveillance, the vicinity of the crime scene, cash machines, public recordings, or private security systems. Sequences, partial occlusions, differing recording situations, and investigations already under way are often added. Comparable questions may also arise in document and passport cases or with historical image sources where an anthropological comparison report is required for classification or attribution.
As a result, the emphasis shifts more strongly to comparability, documentation, and the evaluation of investigative measures already taken. The more preselection, witness nomination, or wanted-person circulation is involved, the more important the transparent presentation of the entire route by which the named person came into focus becomes.
Preliminary review instead of full expert report
Not every enquiry has to lead immediately to a full expert report. In many cases, a short professional preliminary review is more sensible. It clarifies whether the available questioned image is capable of supporting an assessment at all, whether additional comparison material is required, or whether technical visualisation or conversion should come first.
This preliminary stage not only saves effort, but also protects against an instruction whose result would already be very limited for methodological reasons.
Preselection as a particular risk situation
If a person has already come into focus because of external similarity, a witness nomination, a wanted-person measure, or a technical hit list, a preselection situation is likely to exist. In that case, later similarity can no longer be read as neutral. Precisely for that reason, this prior history must be disclosed in the report and taken into account in the evaluation.
For instructing bodies, this is practically important: the mere indication whether and how a named person came into focus changes the later expert classification.
Helpful, therefore, are not only details about the questioned image, but also about the procedural situation, investigative measures already taken, photo line-ups, witness nominations, or other prior identifications. Especially with poorly framed instructions or unsuitable source material, unnecessary loops arise in proceedings; early clarification of the constellation of the case, the evidential question, and the material basis usually avoids this reliably.
Practical enquiry
Helpful are a brief description of the procedural situation, the exact evidential question, information on the available questioned image, and an indication of any investigative or nomination steps already taken. This makes it possible at an early stage to distinguish between the case type, the material problem, and the instruction that is actually capable of supporting an expert examination.