This BMJ article has som useful information to understand the role and staus of 'expert witnesses':
(extract)
"Legal duties of an expert witness
Whether you are acting as an expert in civil, GMC, or coroner’s proceedings, you are expected to work within a fairly strict legal framework as laid down in the Civil Procedure Rules. This duty to the court is paramount, and you are required to give independent evidence, uninfluenced by the pressures of litigation and over-riding any duties to the instructing solicitors. You must be familiar with part 35 of the Civil Procedure Rules and the Practice Direction, which provides guidance on the expert’s role and responsibilities, as well as the GMC’s guidance “Acting as an Expert Witness.”
What makes a good medical expert?
As an expert witness, the GMC requires you to be “honest, trustworthy, objective and impartial.” (continues)
You should restrict your opinion to specific areas in which you have relevant knowledge and direct expertise. A paediatric orthopaedic surgeon should not accept instructions on adult orthopaedic surgery if he or she has not carried out the procedure criticised for many years. Your expertise must be relevant at the time of the criticism and at the time of the report." (coninues)
This article has more information: www.themdu.com/guidance-and-advice/guides/consultant-pack/acting-as-an-expert-witness
Its easy to see why Dr Pasterski was accepted as a 'gender identity' expert given her credentials.
One potential issue seems to be whether she also has sufficient professional expertise in the impact of severe early childhood abuse/trauma and understanding/recognising emotional abuse.
2015 document: "Responsibilities of psychiatrists who provide expert
opinion to courts and tribunals"
The expert’s duties to the court include:
z a duty to assist the process of justice
z a duty to act impartially, objectively and honestly
z a duty to reveal any actual or potential conflict of interest
z a duty to make clear the limits of their knowledge or competence
z a duty to give testimony only in their area or field of expertise
z a duty to state the substance of all facts and instructions given
to them which are material to the opinions expressed in their
report or on which their opinions are based
z a duty to indicate the source of factual information, including
where they have no personal knowledge
z a duty to be accurate and complete
z a duty to mention all matters that they regard as relevant to the
opinions they have expressed
z a duty to draw to the attention of the court all matters that might
adversely affect their opinion
z a duty not to include in their evidence anything that has been
suggested to them by anyone, including the lawyers instructing
them, without forming their own independent view of the matter
z a duty to provide the court with evidence about the range of
opinion, or reasonable opinion, in that area or field, including in
regard to the case at hand
z a duty to make it clear if their opinion is in is any way qualified
or provisional
z a duty promptly to communicate any change of opinion and the
reasons for such change (continues)
www.rcpsych.ac.uk/docs/default-source/improving-care/better-mh-policy/college-reports/college-report-cr193.pdf?sfvrsn=c0381b24_2
As Andrew Gilliagan's Times article demonstrates, some of Dr Pasterski's evidence is in conflict with the approach and professional opinion of the NHS Tavistock (which secifically treats children).
does Dr Pastesrki have sufficient paediatric expertise & experience or is her paractice predominately working with adults as seems likely?
Its also important to consider the substantial whistleblown Safeguarding & Duty of Care growing concerns of other doctors from the field about the medical treatment of children.
See important panel at the House of Lords this week discussing these issues:
www.mumsnet.com/Talk/womens_rights/3583824-Let-your-MP-know-about-this-asap
www.mumsnet.com/Talk/womens_rights/3145612-Tavistock-psychologist-is-worried-about-rush-to-label-kids-as-trans