| 摘要 |
Instances have been discovered in which a person has inserted the needle of a first hypodermic syringe through the soft rubber drive piston of a second hypodermic syringe to aspirate some of the narcotic fluid from the second syringe into the first syringe. To prevent this mode of pilfering, an impenetrable barrier is included in the second syringe to prevent the insertion of the needle of the first syringe. In the present invention, the impenetrable barrier is the head of a screw that extends through the drive piston for attaching the actuating rod used in moving the drive piston. In accordance with the present invention, the diameter of the head of the screw differs from the diameter of the tubular member by an amount not exceeding the diameter of the smallest needle that would normally be used for pilfering, namely 0.018 inches.
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