Possible Clues:

• Presumably, if you do drugs you'll need this to give to drug dealer for supply
• Presumably, if you do drugs you'll need this to give to drug dealer for your supply
• Finding tear inside, inspector altered spec for specs?
• Copier prints erratically -- instruction needed
• Detective grasps it's about writing on drugs, on paper
• Copiers print out what is sometimes illegible from the doctor
• See 16-Down
• This will make you well, provided you're sick enough to need one
• Puts someone right with direction to pharmacist
• What a doctor may write