Being arrested, even if never convicted, even if never charged with a crime and released with a hug and an apology, will have long-lasting negative effects on your life. For example, a citizen of a Visa Waiver Program country cannot travel to the US visa-free for the rest of his or her life if they have ever been arrested. They have to apply for a visitor visa and convince an immigration officer that they deserve a visa. Just a simple mistaken identity arrest can make the rest of your life difficult and there is nothing you can do to fix it, you just have to endure it.