# So apparently I was arrested for possession of drugs in Canada

**URL:** <https://boards.straightdope.com/t/so-apparently-i-was-arrested-for-possession-of-drugs-in-canada/508698>\
**Category:** Miscellaneous and Personal Stuff I Must Share\
**Created:** [September 2, 2009, 11:55pm UTC](https://boards.straightdope.com/t/so-apparently-i-was-arrested-for-possession-of-drugs-in-canada/508698 "2009-09-02T23:55:52Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![phi2dao](https://avatars.discourse-cdn.com/v4/letter/p/6de8d8/32.png) [@phi2dao](https://boards.straightdope.com/u/phi2dao)\
**Post date:** [September 6, 2009, 10:09pm UTC](https://boards.straightdope.com/t/so-apparently-i-was-arrested-for-possession-of-drugs-in-canada/508698/21 "2009-09-06T22:09:13Z")

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> [@runner pat](#):
>
> That would mean there are as many as 9,999,999,999,999,999 cards in the world, enough for appx. 14,000 cards per person worldwide.  
> The odds are long you could randomly guess a valid card number.

Actually, there are far fewer possible numbers. There is something called the [Luhn Algorithm](http://en.wikipedia.org/wiki/Luhn_algorithm) which is used to create most credit card numbers.

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