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Castorina v Chief Constable of Surrey (1988) CA: Study Guide
Case Summary: This case concerns the interpretation of "reasonable cause" for arrest under Section 2(4) of the Criminal Law Act 1967. Castorina was arrested for suspected involvement in a burglary, based on suspicion it was an "inside job" and she might harbor a grudge against the company. The lower court found the arrest unlawful, arguing that "reasonable cause" required more investigation before arrest (e.g., questioning Castorina about a grudge). The Court of Appeal overturned this decision.
Key Issue: What constitutes "reasonable cause" for arrest under Section 2(4) of the Criminal Law Act 1967? Does it require exhaustive investigation before arrest, or simply a reasonable suspicion based on available information?
Facts:
  • The Offence: Suspected involvement in a company burglary.
  • The Arrest: Police suspected an "inside job" and that Castorina might be involved due to potential grudge against the company.
  • The Lower Court Decision: Ruled the arrest unlawful, stating "reasonable cause" necessitates further investigation before arrest (e.g., questioning Castorina about a grudge). Awarded Castorina £4,500 damages.
  • The Appeal: The Chief Constable appealed the lower court's decision.
Court of Appeal Decision:
  • The Ruling: The Court of Appeal overturned the lower court's decision. They found sufficient information existed to provide the arresting officers with "reasonable cause" to suspect Castorina's guilt.
  • The "Reasonable Cause" Test: The court clarified that "reasonable cause" does not require exhaustive pre-arrest investigation. While a failure to conduct obvious inquiries could render an arrest challengeable under the Wednesbury principle (irrationality), the primary focus is on whether reasonable suspicion existed at the time of the arrest, not on what further steps might have been taken.
  • The Wednesbury Principle: The court acknowledged that exceptionally, failure to pursue obvious lines of inquiry could make the arrest challengeable under the Wednesbury unreasonableness test (Associated Provincial Picture Houses Ltd v Wednesbury Corp). However, this was not the case here.
  • The Lower Court's Error: The lower court erred by focusing on what further investigations should have been conducted instead of solely determining if reasonable suspicion existed at the time of the arrest.
Key Legal Principles:
  • Section 2(4) Criminal Law Act 1967: Defines the legal basis for arrest without a warrant based on "reasonable cause" to suspect an arrestable offence and the guilt of the suspect.
  • "Reasonable Cause": The Court of Appeal interprets this as an objective standard—would an ordinary, reasonable police officer have had sufficient information to suspect guilt? It does not automatically require exhausting all lines of inquiry before arrest.
  • Wednesbury Unreasonableness: This principle provides a narrow avenue for challenging an arrest if the decision to arrest was so unreasonable as to be irrational.
Study Questions:
  1. What is the key difference between the lower court's and the Court of Appeal's interpretation of "reasonable cause" for arrest?
  2. Under what circumstances might a failure to conduct further inquiries before arrest be challenged under the Wednesbury principle?
  3. Explain the objective nature of the "reasonable cause" test as established in this case.
  4. How does this case affect police powers to arrest without a warrant?
  5. Why did the Court of Appeal reverse the lower court's decision? What was the fundamental legal error made by the lower court?
This study guide provides a structured overview of Castorina v Chief Constable of Surrey. By addressing the study questions, you'll solidify your understanding of the key legal principles and the implications of this important case.


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