<story><title>British journalist held by police at Luton airport for five hours without arrest</title><url>https://www.theguardian.com/media/2023/sep/20/british-journalist-held-by-police-at-luton-airport-for-five-hours-without-arrest</url></story><parent_chain><item><author>isk517</author><text>My question is out of those 2,498 people stopped how many of them actually had links to terrorisms? I will be extremely generous and say if the number is less than 2000 than sounds like you just have a system in place to harass random people.</text></item><item><author>perihelions</author><text>- &lt;i&gt;&amp;quot;Official figures show 2,498 people were stopped under schedule 7 powers in the year to 30 June, down 6% from a year before.&amp;quot;&lt;/i&gt;&lt;p&gt;They must employ an entire shift of airport workers dedicated to harassing journalists.&lt;p&gt;Also:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.theguardian.com&amp;#x2F;world&amp;#x2F;2013&amp;#x2F;aug&amp;#x2F;18&amp;#x2F;glenn-greenwald-guardian-partner-detained-heathrow&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.theguardian.com&amp;#x2F;world&amp;#x2F;2013&amp;#x2F;aug&amp;#x2F;18&amp;#x2F;glenn-greenwal...&lt;/a&gt; (&lt;i&gt;&amp;quot;Glenn Greenwald&amp;#x27;s partner detained at Heathrow airport for nine hours&amp;quot;&lt;/i&gt;)&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=6233646&quot;&gt;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=6233646&lt;/a&gt;</text></item></parent_chain><comment><author>EvgeniyZh</author><text>For imbalanced data, even accurate system will give tons of false positives. Unless you are willing to tolerate false negatives, having large false positive rate is almost inevitable. Rare disease testing is a popular example, but this one is a good instance to I think.&lt;p&gt;Let&amp;#x27;s say there are 10 million people linked to terrorism in the world and the system is correct 95% of times. Then out of 20000 people, 20 are positives, and 19 will be stopped; out of 19980 negatives, 999 will be stopped.&lt;p&gt;Compared to disease testing you may argue that FP is more harmful, but that&amp;#x27;s a different question. The point is that even very non-random system will be dominated by FP.&lt;p&gt;Edit: in particular, if they stop truly random people and 500 of them are linked to terrorism that implies that 20% of all people passing there are terrorists.</text></comment>
<story><title>British journalist held by police at Luton airport for five hours without arrest</title><url>https://www.theguardian.com/media/2023/sep/20/british-journalist-held-by-police-at-luton-airport-for-five-hours-without-arrest</url></story><parent_chain><item><author>isk517</author><text>My question is out of those 2,498 people stopped how many of them actually had links to terrorisms? I will be extremely generous and say if the number is less than 2000 than sounds like you just have a system in place to harass random people.</text></item><item><author>perihelions</author><text>- &lt;i&gt;&amp;quot;Official figures show 2,498 people were stopped under schedule 7 powers in the year to 30 June, down 6% from a year before.&amp;quot;&lt;/i&gt;&lt;p&gt;They must employ an entire shift of airport workers dedicated to harassing journalists.&lt;p&gt;Also:&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.theguardian.com&amp;#x2F;world&amp;#x2F;2013&amp;#x2F;aug&amp;#x2F;18&amp;#x2F;glenn-greenwald-guardian-partner-detained-heathrow&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.theguardian.com&amp;#x2F;world&amp;#x2F;2013&amp;#x2F;aug&amp;#x2F;18&amp;#x2F;glenn-greenwal...&lt;/a&gt; (&lt;i&gt;&amp;quot;Glenn Greenwald&amp;#x27;s partner detained at Heathrow airport for nine hours&amp;quot;&lt;/i&gt;)&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=6233646&quot;&gt;https:&amp;#x2F;&amp;#x2F;news.ycombinator.com&amp;#x2F;item?id=6233646&lt;/a&gt;</text></item></parent_chain><comment><author>lessname</author><text>Great question. The journalist named in the article (Matt Broomfield) is asking authorities to delist the PKK (which clearly IS a terrorist organization targeting civilians) as a terrorist organization.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;twitter.com&amp;#x2F;MattBroomfield1&amp;#x2F;status&amp;#x2F;1509206466351276037&quot; rel=&quot;nofollow noreferrer&quot;&gt;https:&amp;#x2F;&amp;#x2F;twitter.com&amp;#x2F;MattBroomfield1&amp;#x2F;status&amp;#x2F;15092064663512760...&lt;/a&gt;</text></comment>