For example
Whilst there is no specific law that applies, a constructive trust may be deemed to exist.
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Describing something which may not be set out in the law but will nevertheless be considered to exist.
Constructive dismissal can be said to have occurred when an employer breaks fundamental terms of a contract of employment, and as a result the employee has been forced to resign.
The employee can apply for a hearing before an industrial tribunal.
Presuming something is known. The law sometimes presumes that a person knows something even though they do not.