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HR will most likely present the offer to the candidate. It really is best as they will be able to answer questions associated with benefits, first paycheck date, etc.
If possible, it would be a good idea to set a probationary period of 90 days. This would give you the right to let someone go if they are not performing up to standards. You should find out if this is possible before making the final offer. If not, you should try to lobby this idea for future new hires.