B a drug that can treat hepatitis b cannot be patented because the medical and health administrative department thinks that the side effects of the drug exceed the standard, and it is not allowed to go on the market.
C riot weapons used by public security departments that can blind people. Because the use of this weapon will cause people to be disabled, this weapon cannot be patented.
D. a device that can hear others talking through the glass. Because the device may be used for eavesdropping and endanger public order, it cannot be granted a patent right.
Answer: ABD