4.8 You must only prescribe controlled drugs to which you are legally entitled.
http://www.nes.scot.nhs.uk/media/2554353/25-02-14_goodprescribingpractice_updated_fr.pdf
is "to" a preposition?
is "which you are legally entitled" a relative clause modifying "drugs"?
8 You must only prescribe controlled drugs to which you are legally entitled. is "to" a preposition? Yes, but it's in the wrong position.
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4.8 You must only prescribe controlled drugs to which you are legally entitled.
is "to" a preposition? Yes, but it's in the wrong position. The verb phrase is be entitled to. The full sentence is
You must only prescribe controlled drugs which you are legally entitled to (prescribe).
Yes, "which you are legally entitled to" is a