[ikka]

All 911 lines have caller ID but if the caller blocks it they can not tell who is calling

Sorry, you are wrong. They can --always-- tell who is calling, or can find out.

[marktwain]

riverrunner posted:

“All 911 lines have caller ID but if the caller blocks it they can not tell who is calling”

ikka replied:

“Sorry, you are wrong. They can —always— tell who is calling, or can find out.”

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I believe you both are correct. The state of the equipment of 911 operators varies all over the nation. They may not be able to tell who is calling at a particular station, but they can always get a warrant to determine who called, or more properly, what telephone the call was from, by using the telephone company records.