What countries blindly protect their own citizens from extradition?
<p>I was surprised to learn (in the background for the recent
<a href="https://en.wikipedia.org/wiki/2019_Hong_Kong_anti-extradition_bill_protests" rel="nofollow noreferrer">protests</a>) that a Hong Kong resident can murder someone in Taiwan
and go back to Hong Kong with no consequences
(by the way, the murderer is actually imprisoned now in Hong Kong for a few years because he used the victim's money in Hong Kong, but I want to consider a
hypothetical case for this question where he took no money).</p>

<p>Since USA has no extradition treaty with Taiwan (though USA has many more extradition treaties than Hong Kong has), could a USA resident do the same thing without penalty?  In other words, even with proof sent from Taiwan and a confession, would USA really not be
allowed to send the murderer to Taiwan or somehow penalize him?  This is hard to believe, so I wonder if there's a special law to deal with this in USA similar
to the law being considered in Hong Kong.  I have reviewed <a href="https://law.stackexchange.com/questions/23121">this similar question for a less serious crime</a> which makes me think the USA state might be important, so assume California.</p>

<p>Also, every extradition treaty I have read is retroactive (meaning crimes before
the treaty was signed can cause extradition).  Is that usually true?
Is the new proposed law in Hong Kong retroactive?</p>

<h2>The default is that countries are not required to repatriate alleged criminals</h2>

<p>It is one of the cardinal provisions of sovereignty that one country cannot "reach into" another country's territory for any reason. However, countries can <em>voluntarily</em> repatriate an alleged criminal subject to their own legal systems allowing this. This can be ad-hoc or through a longer-term extradition treaty.</p>

<p>Even where <a href="https://en.wikipedia.org/wiki/Extradition" rel="noreferrer">extradition</a> is allowed, there are common things that will prevent it:</p>

<ul>
<li>Dual criminality - generally, the alleged crime must be a crime in both jurisdictions,</li>
<li>Political crimes are usually not subject to extradition</li>
<li>Possibility of certain types of punishment - nations without the death penalty will generally not extradite for alleged capital crimes. This can be overcome with appropriate guarantees that such a penalty will not be sought.</li>
<li>Jurisdictional issues</li>
<li>Own citizens - some countries will not extradite their own citizens notably Austria, Brazil, the Czech Republic, France, Germany, Japan, Norway, the People's Republic of China, the Republic of China (Taiwan), Russia, Saudi Arabia, Switzerland and Syria.</li>
<li>Fair trial standards - extradition will usually be refused when a fair trial cannot be expected.</li>
</ul>

<p>That case with Hong Kong and Taiwan is extremely specific to the relationship among China, Hong Kong and Taiwan.</p>

<p>And neither Hong Kong nor Taiwan really is free to act as a full country on the world stage. Hong Kong is a "special region" of China, desperate to hold on to what remains of their independent legal system; Taiwan is a "region" with which other countries (save a few) have "trade relationships" while allowing China to pretend it's part of them. The degree to which either one of them acts like a "country" is an ongoing game of charades, with one eye always on the mood in Beijing.</p>

<p>Nobody in Hong Kong wants to harbour this guy, but neither do they want to expose themselves needlessly to China's court system, which is notorious as an agency of political whim. If they started shipping people to Taiwan on Taipei's request, they'd immediately get a log list of people that Beijing wants to put on trial (or just jail). So they've adopted a policy of very restrictive extradition: they won't ship their people to China, or anywhere else.</p>

<p>And the fact that it's Taiwan involved, instead of like Australia, makes this a complete powderkeg. I presume that Beijing would claim jurisdiction over criminality in Taiwan, so would be pleased to make a big show trial of this guy in China...but getting witnesses and police to testify in court in China would be a political nightmare. </p>

<p>And any kind of dealing directly with Taiwan, firstly in a way that would seem to recognize it as a country, and secondly on terms more favorable than they've been using with China, would be such an offence to the Beijing government that they'd likely be provoked to just rip up Hong Kong's special agreement. Which, of course, may be in progress anyhow.</p>

united-states extradition hong-kong