Forensic Mental Health Professionals (FMHP) have an ethical and moral obligation to children and their families to use the best tools currently available for data gathering and analysis. The using of state-of-the-art forensic methods and procedures results in more reliable data thereby, producing a more probative report meeting the needs of the family and the courts. One goal of a competent forensic evaluation should be to assist the court in understanding the scientific underpinnings of a child custody report. This paper discusses science as a method and argues that child custody evaluations need to follow scientifically sound methods. A more detailed structure is proposed for FMHP's to use when reviewing the quality of their work product. The paper integrates the methods and procedures of a scientifically informed child custody evaluation with criteria for admissibility of a scientific work product, focusing on issues of reliability and relevance. A set of questions are provided that may be useful to FMHP's in assessing whether a child custody evaluation they have conducted may meet at least minimal standards of legal reliability and relevance. Appendices A and B and references