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Evidence Obtained by Unlawful Search — Scope of the Exclusionary Rule
Public Prosecutor v Defendant (Challenging Search Validity)
Composite summary — not a single reported case. This entry distils a settled line of Thai Supreme Court (Dika / ฎีกา) authority for legal education. It is not a transcript of one reported judgment, and the heading is not a citable case number. Do not cite it as specific case law — consult a Thai-qualified lawyer for the authoritative Dika number and current application.
Facts
Police conducted a search — of a vehicle, premises, or person — without a search warrant or outside the conditions in which warrantless search is permitted. In disputed cases, officers relied on alleged 'reasonable grounds', 'consent', 'plain view', or claims of urgency. Evidence (drugs, weapons, documents, phones) was seized and used as the basis for prosecution. The defendant challenged admissibility under Section 226 (and now Section 226/1) of the Criminal Procedure Code.
Legal Issue
When evidence obtained from an unlawful search must be excluded from a Thai criminal trial, and how the court balances exclusion against public interest in conviction.
Holding
The Supreme Court has held that Section 226/1 CPC introduced (in 2008) a structured exclusionary discretion: evidence obtained unlawfully may be inadmissible, but the court weighs (i) the seriousness of the legal violation, (ii) the seriousness of the offence under investigation, (iii) the reliability of the evidence, and (iv) the impact on the administration of justice. Serious procedural violations — particularly warrantless search where a warrant was practical to obtain — increase the likelihood of exclusion.
Reasoning
Section 226/1 reflects a compromise between common-law style exclusion (per se exclusion of unlawfully obtained evidence) and civil-law style admissibility-with-weight. Thailand chose discretionary exclusion balanced against public interest. The court is the gatekeeper of trial fairness.
Significance
Most relevant to drug, weapons, and electronic-evidence prosecutions. A successful exclusion challenge can collapse a case at trial.
Practical Takeaway
Defence counsel should challenge search legality early — get the warrant (or note its absence), the basis for any warrantless entry, the recording of consent, and the chain of custody. Police should obtain warrants whenever practicable and document the basis for any warrantless action.
Cited Statutes
- Criminal Procedure Code, Sections 92, 96, 132, 226, 226/1
- Constitution of the Kingdom of Thailand B.E. 2560 (2017), Section 32
This entry summarises a representative line of authority from the Thai Supreme Court (ฎีกา). It is intended for general legal education only and is not a substitute for advice from a Thai-qualified lawyer. Individual Dika case numbers are being verified against primary sources; until then these entries are presented as composite doctrinal summaries.
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