Is TSA PreCheck random?

Related questions

1. Can you use a mobile boarding pass to get through security?
2. Can I get TSA PreCheck for free?
3. How does Wallet work on iPhone?
4. How do I get my boarding pass on wallet?
5. Is a boarding pass the same as a ticket?
6. Can you send a boarding pass to another phone?
7. Can I use mobile boarding pass to get through security?
8. How do I use wallet on iPhone?
9. Does TSA PreCheck show on mobile boarding pass?
10. How do I take a screenshot of a boarding pass?

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