An intoxicated driver capability tester comprising a bridge circuit for producing an unbalanced output by detecting alcohol, a NOT circuit for producing an output 1 when said unbalanced output is more than a reference value, a display device for random numbers which is activated by one output of the NOT circuit, and a NAND gate for receiving the other output of the NOT circuit as one input thereof and receiving the output of the display device for random numbers as the other input thereof.
