Digital Shield provides mobile device forensics services and specializes in tool validation. They conduct thorough investigations of digital evidence and defend findings in court. Their presentation discusses the importance of validating tools and techniques used to extract data from mobile devices. It describes several validation methods like manually reviewing phone contents and searching databases to check for missed or misinterpreted data compared to tool extractions. They raise questions about whether tools fully decode extracted data and whether detectives could have overlooked something. Their goal is to help clients understand what mobile forensics tools can and cannot do and to thoroughly validate any data collected from investigations.