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THEREASONABLESEARCH · A GUIDE FOR UK LAWYERS What Is a Reasonable Electronic Search? Custodians, Dates, Keywords, Analytics and Defensibility COMPUTER FORENSICS LAB DISCOVERY. UK

§ ABOUT THE AUTHOR PREPARED BY COMPUTER FORENSICS LAB E-DISCOVERY TEAM ACPO / NPCC DIGITAL EVIDENCE PRINCIPLES SEARCH-TERM NEGOTIATION SUPPORT TAR / CAL WITH STATISTICAL VALIDATION FULL CHAIN-OF-CUSTODY DOCUMENTATION

§ CONTENTS In this guide 01 Executive summary 02 The problem in plain English: two ways to fail 03 The legal standard: CPR 31.7, PD 31B and PD 57AD 04 Lever 1 · Custodians 05 Lever 2 · Date ranges 06 Lever 3 · Sources 07 Lever 4 · Keywords 08 Lever 5 · Analytics and technology-assisted review 09 Lever 6 · Proportionality 10 Lever 7 · Sampling and validation 11 Worked examples: the overly narrow search 12 Worked examples: the excessively broad search 13 Defensibility: the paper trail behind the search 14 Negotiating search terms with the other side 15 Common mistakes and technical limitations 16 Questions to ask · Suggested wording for instructions 17 Checklist and red flags · When to involve a digital forensic expert 18 Frequently asked questions 19 Glossary · References · Disclaimer · How a specialist laboratory can assist

§ 01 · ORIENTATION Executive summary THE HEADLINE ANSWER: WHATISAREASONABLESEARCH?

§ 02 · FIRST PRINCIPLES The problem in plain English: two ways to fail THE KEYHOLE (OVERLY NARROW) THE LANDSLIDE (EXCESSIVELY BROAD)

§ 03 · THELAW The legal standard: CPR 31.7, PD 31B and PD 57AD FOR THE PRACTITIONER