Final answer:
The percentage of local police departments in the United States that do not use bicycle patrols is 88%.
Step-by-step explanation:
The percentage of local police departments in the United States that do not use bicycle patrols can be calculated by subtracting the percentage that do use bicycle patrols from 100%. In this case, since 12% of local police departments use bicycle patrols, the percentage that do not use bicycle patrols would be 100% - 12% = 88%.