Some aspects of the invention include a card for a MARS pill pack and tag. The card has a cut-out open to an edge of the card or an aperture spaced from edges of the card for receiving the tag, with contacts arrayed at one side at least of the cut-out or aperture. The card has at least one formation in the card at at least one other side of the cut out or a tag backing strip extending at a side of the aperture opposite from the one side, the formation(s) or the tag backing strip being provided to hold the tag against movement parallel to the card whereby tag contacts are retained in contact with the card contacts in use.
