No other country relies on road travel to the extent of America, so I am not sure there is a good comparison to make.
That's a reason the US needs better enforcement tools, not worse ones.
If we can pay for the roads and the patrols, we can pay to equip the patrols. Bigger needn’t equal worse.
We have a bigger road network. We have a larger road travel infrastructure. So, we should have enough chemical test units to cover our infrastructure.