This is similar to the one my son carries in his truck [ locked in a metal box]:
http://www.emory.edu/EEMS/JumpBag.html
Sharps Container: a hard-sided box for the disposal of needles and other materials which may pose a puncture hazard to the EMT
Drug Kit: Contains oral glucose, nail polish remover and insect wipes
Activated Charcoal: a high surface area form of charcoal which binds to ingested substances and prevents absorption
Blood Pressure Cuffs: three sizes for adult, pediatric and obese patients
Glucometer: used to determine the blood glucose level of patients and assess for hyper- or hypoglycemia
Pulse-Oximeter: measures the oxygen saturation in the patient's blood
Saline and Non-Sterile 4x4s: used for cleansing wounds
Thermometer
Tape: carried in 1", 2" and 3" sizes
EMS Field Guides
Trauma Shears: for the removal of a patient's clothes which are interfering with a proper medical assessment or treatment
Pen Light: used to assess a patient's pupillary response
Stethoscope: used both for listening to the patient's heart and lungs
Miscellaneous: isagel (water-free hand sanitizer), window punch, face mask, razor, ring cutter, tongue depressors, hydrogen peroxide, convenience bags and multi-trauma dressings
Epi-Pens: epinephrine autoinjectors, both pediatric and adult, used in the treatment of anaphylaxis
Band-Aids
Tape
Saline Flushes: these are used to flush an IV line when it is not going to be connected to a normal saline drip, thus avoiding clotting and ensuring a patent line
Needles: BD Insyte Autoguard Shielded IV Catheter, in sizes of 16, 28, 20 and 22 gauge
Catheter Extension Set
Iodine Prep: an iodine solution used to cleanse the IV site, generally not
used because of the risk of allergic reaction
IV Start Kit: contains 2 gauze pads, a tourniquet, a Tegaderm dressing, catheter extension tubing and an alcohol prep pad
Albuterol Ampules (not pictured): 2.5 mg ampules of albuterol
administered to patients experiencing a moderate to severe asthma attack
D50 (not pictured): 25 mg of a 50% dextrose solution administered via slow IV push to hypoglycemic patients
Hot and Cold Packs: chemical hot and cold packs
Sterile Dressings: includes sterile 4x4s, combine dressings, eye pads, petroleum gauze and masks
Looking at the list, I guess it would be the needles that would be interesting to a drug addict. They could also sell the albuterol and the epi pens, I suppose.