Proportionality
Definition
The legal principle, central to European human rights law and to many constitutional systems, that any interference with a fundamental right must be no greater than necessary to achieve a legitimate aim. In DNA law, it governs who may be profiled, for how long, and for what category of offence.
- Legal domain
- Human rights and constitutional law
- Core test
- Interference with a right must not exceed what is necessary for its aim
- Forensic application
- Governs DNA database retention, sampling scope, offence category
- Key instrument
- European Convention on Human Rights, Article 8, in the EU/UK
Common questions
How does proportionality limit DNA database retention?+
Courts have required that indefinite retention of DNA profiles from people never convicted of an offence be time-limited or removed, since keeping the profile indefinitely goes beyond what is necessary for crime prevention. Retention rules therefore vary by conviction status and offence severity.
Does proportionality apply the same way in every jurisdiction?+
No. Countries with a written proportionality test in their constitutional or human rights framework, such as EU member states, apply it as a formal legal standard, while jurisdictions without that doctrine rely on statutory limits or judicial discretion to achieve a similar restraint.
How does proportionality affect the scope of a forensic search?+
It requires that the intrusiveness of a search or sampling method, such as a familial DNA search sweeping in relatives, be justified by the seriousness of the offence being investigated rather than applied routinely to minor crimes.
Related terms
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Explained in these topics
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