130. An analysis of all available evidence leads to a final conclusion. In general terms, this could be: (a) Identification where there is consistency between ante-mortem and post-mortem data and there are no discrepancies that cannot be explained (b) Rejection of a possible identity when evidence supports the exclusion of a particular hypothesis about the identity of the human remains, or (c) No conclusion about the identification of the human remains. The relevant findings should be stated in the final report on identity. There may be cases when, despite all possible scientific efforts to achieve identification, available information indicates only a probable/possible identity. Whether the death is that of an individual or of multiple individuals in one event, families should be involved in and fully informed about the identification process. In many cases, this is not only necessary to achieve an identification, it also improves the likelihood that the family will accept the identification, which is an important part of accountability for potentially unlawful death(s), as set out above. Careful attention to clear communication will also improve the chances of a successful outcome. F. Types of Evidence and Sampling 1. General principles 131. A range of types of evidence should be considered when collecting samples and evidence of human remains. Sample sizes for both biological and non-biological evidence should be sufficient for laboratory analysis and should allow for repeat testing. 2. Human biological evidence 132. Biological evidence in forensic analysis generally refers to organic substances collected from the human body or its surroundings. These can be collected directly from the human body or from items used by the person in question, such as toothbrushes, hair brushes and unlaundered clothing. 133. Identification and the proper collection and preservation of biological samples from a crime scene require specialized training in searching and testing for the presence of biological evidence. Biological samples from bodies may also be collected at the morgue or forensic anthropology laboratory. The collection of biological reference samples from living persons, for comparison purposes, should be conducted by personnel trained in dealing properly and ethically with victims and their families, and should be based on informed consent. 24 The Minnesota Protocol on the Investigation of Potentially Unlawful Death (2016) 134. Biological samples are also a source of DNA, which can be used to establish the identity of persons and link them to the scene or to a piece of evidence recovered there. Biological samples include the following: nn Soft tissues nn Bone nn Teeth nn Blood nn Urine nn Saliva nn Semen/sperm nn Vitreous fluid nn Hair nn Natural nails (finger and toe).