Because some drugs are only legal as a perscription like vicadin or ridalin while others are legal to buy like vitamin D and cold medicine.
I think the flat hard surface is to ensure that the patients arm will not move when the needle is administered since it is usually critical that the needle is inserted in the correct vein which is only a fine target requiring careful positioning of the needle.
Recovery time<span> includes 3-4 weeks in a weight-bearing brace or cast.</span>
