“5. Where sexual abuse has occurred, it is not commonly witnessed by an independent third party. Beyond issues of social stigma, perpetrating adults are often reluctant to make admissions in the context of family proceedings in circumstances where they face, or may face, criminal prosecution. The alleged victims of sexual abuse are often vulnerable children with other difficulties that can affect the credibility of their allegations, which allegations often emerge a considerable time after the alleged abuse has taken place, and therefore long after any physical evidence that may have existed has disappeared. The allegations may emerge in a piecemeal fashion, with children often not reporting events in a linear history, reporting them in a partial way and revisiting topics more than once. Such children may, whether by reason of their age, or the impact of the alleged sexual abuse or other difficulties, be idiosyncratic, inconsistent, or unreliable historians. The age, psychological state and/or views of the child may mean … that the court does not hear their accounts challenged forensically in cross examination and, accordingly, is deprived of one of the key forensic tools for testing the truth of a disputed account before the law. The child may suffer from psychological sequalae that may or may not be the product of sexual abuse but which, in any event, makes the assessment of their reliability even more difficult. It is not unknown for children to lie about having experienced sexual abuse or to fabricate allegations of the same. 6. More generally, human memory is not a single, simple system. What is remembered of an experience by a child or young person will not be a complete picture akin to a photograph or CCTV recording and will vary depending on the age at which the experience took place. What an adult may consider to be a key element of a remembered experience, and therefore key to assessing the reliability of the memory, may not be significant from a child’s perspective. The physiological processes involved in the encoding, storage and retrieval of memories are susceptible to internal and external influences. Within this context, children’s accounts can be affected by their level of functioning, their emotional state and their levels of suggestibility. It is also possible for a child to ‘remember’ an event that has not in fact occurred, or which has not occurred precisely in the way remembered. The child’s recollection of past experiences can be influenced by the process of questioning the child … 7. This means that, within the context of other already considerable forensic challenges, and of particular significance in this case for reasons that will become apparent, the ill-considered reaction of well-meaning adults to children making allegations of sexual abuse, or a failure by professionals to apply rigorously long-established guidance and good practice in dealing with such allegations, can have a deleterious, and sometimes fatal impact on the reliability of the allegations when they come to be considered by the court. In cases of alleged sexual abuse, there is a significant forensic tension between the need to provide understanding, support and care for children who may have been sexually abused, where the presence of a supportive non-abusing adult who listens without judgment and takes seriously what the child is saying is essential to that child’s current and future wellbeing, and the requirements of the legal process for establishing the truth or otherwise of those allegations in a court of law. That difficult forensic tension falls to be addressed in this jurisdiction by the careful, rigorous, and diligent application of comprehensive statutory guidance and good practice principles born out of long experience. The gravity of the consequences of a failure to apply with rigor these clear and long-established principles when dealing with allegations of sexual abuse was set out with pellucid clarity by Wall J (as he then was) in B v B (Child Abuse: Contact) [1994] 2 F.L.R. 713, in which he observed that: ‘… by muddying the waters, it frequently renders impossible the task of the court in deciding whether or not there has been abuse. Thus, it may not be possible to make a finding against an alleged perpetrator who is in truth guilty’. 8. Finally, the possibility of much easier access to pornographic material on social media and the Internet means that concepts such as age-appropriate sexual knowledge, and conclusions as to the source of detailed knowledge of specific sexual acts must be treated with far greater care than in the past. Medical evidence in cases of alleged child sexual abuse is rarely definitive and very often non-specific, ambiguous, equivocal or, on occasion, controversial. Within this context, experienced medical professionals and experts in the field may reasonably reach different conclusions on a given physical presentation. Research and practice as between jurisdictions may differ in this regard. 9. The consequences of the court reaching the wrong conclusion in respect of an allegation of child sexual abuse include a child being returned to a position of danger or, conversely, a child being deprived of a family that is, in fact, perfectly safe. In the circumstances, when determining whether sexual abuse has taken place and, if so, who is responsible for perpetrating that abuse, it is vital that the court remain acutely conscious of the forensic difficulties outlined above. As Holman J observed in Leeds City Council v YX & ZX (Assessment of Sexual Abuse)[2008] EWHC 802 (Fam) the task of the court in cases of this nature is not so much akin to putting together a single jigsaw puzzle in which all the pieces are present, but rather: ‘If the jigsaw metaphor is helpful at all, then, in my view, it is important to think of a pile of jigsaw pieces in which pieces from more than one jigsaw have been muddled up. There may be pieces which, on examination, do not fit the jigsaw under construction at all, but which require to be discarded or placed on one side’”