How can Spain, France, Italy and California enforce the lockdown order?

Lightningfire
California is the latest state to be in total lockdown after Spain, France and Italy, requiring everyone to remain in their homes to reduce the spread of Coronavirus. However, how are they going to know if someone’s out for no valid reason? Especially, in California’s remote deserts or France and Italy’s Alps. Will people driving in from Nevada, Arizona and Oregon be prosecuted?
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Also, what if you’re not from those areas and are just visiting, are you allowed to go home?
How can Spain, France, Italy and California enforce the lockdown order?
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