Bad workmanship? Code violation/s? Or plain bad luck?

[Pacifi]

Help please!!

Found water supply line joint (cpvc to copper) leaking in the interior of bath wall.
Bad Workmanship and/or Code violation/s?

Please see video here:
https://drive.google.com/open?id=1qhs4kHh06TNQgYQzFwnercJyxyde1rEW

Location: California. Year built: 2009-2010

Thanks in advance

 

[Plumber69]

Why do people even use that pipe any more?

 

[Sponsor]

 

[Dj2]

Re-do the two elbows, let the pipe cement dry according to the instructions before turning the water on and with a little bit of luck you will stop the leak.

Where in CA is your house located?