No, overturned itself is not a prefix. However over is a prefix
that means excessive.
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No, it is not. It is the past tense and past participle of the
transitive or intransitive verb (to overturn) and can be used as an
adjective (e.g. an overturned ruling, an overturned vehicle).
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by allowing unconstitutional laws to be challenged and
overturned
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state law would be overturned it it violated the
constitution