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If the U17 has completed the appropriate playing out adult rugby form and is eligible (and appropriate) do so they can take part in contact training out of season as they are then in the adult game not age grade at this point. They are therefore treated as adults at this point and for example would be considered so for disciplinary purposes.
In all other situations (i.e. they are age grade players) then they may do contact as per out of season regulation and they may do contact in the last two weeks immediately prior to the start of the Season when pre-season training and training matches are permitted.