[Snorlax94]

I still like a tech-based answer to getting much of the contact information, with little effort, and some loss of privacy (but each individual gets to make that choice, not have it handed down from some government entity).  The so-called Singapore tracking app is one example.

YES THIS. Similar to many posters above, one of my frustrations (and apparently, Governor Newsom's) is that other states are not on lockdown. The Bay Area was the first in the nation to go on lockdown. Let's say the Bay Area and CA gets it under control by June 1. Then people start flying in from all over the country and from other countries, and it starts all over again. Then we will be the first to hammer again, and again. 

IF we had widespread testing and contact tracing, this might work. But, well, I think many of us are similarly frustrated at this point.

I don't know what's in the Singapore App, but based on what I've read bout apps in Korea and China and how they're used, how about this for a technological solution: The Quarantine CA App. This idea is not about contact tracing, so it avoids many of the privacy issues -- it's just about enforcing quarantines or proving immunity.

There could be three levels: (1) Documented immunity, (2) Documented recent test (proving Negative), (3) Quarantined Recently, (4) Newcomer.

When the lockdown lifts, CA could block all new tourists, newly returning people (Category 4 - Newcomer) from entering any non-essential service. Two prove you were quarantined recently, you had to install an (intrusive) app for 14 days and PROVE you stayed at home for the 14 day quarantine. The app could constantly track your location, and you might, for example, take photos or receive calls to prove you are who you say you are, when you say you are there.

Similar to what I've read in China, when CA re-opens, we should block people from entering shopping malls, restaurants, and other non-essential locations until they prove they quarantined.
This would serve many purposes:
1) Protect CA from people flying in and re-spreading the disease
2) Increase compliance with the quarantine (you'll want to prove you've been home for 14+ days)
3) Discourage tourism to CA this summer+fall

We could have reciprocal agreements with other states so if you proved you quarantined for 14 days in say, Oregon, and drove down, CA might honor an Oregon post-quarantine person.

For urgent needs, someone could fly in and take a test at the airport and wait for a quicker clearance while at a quarantine airport hotel.

If the privacy issues could be dealt with, then known exposure could knock you back down to category 4 (let's say a co-worker or a child at your child's school tested positive). But this could be very hard to do due to privacy concerns, so this part wouldn't be required in the 1.0

I don't know about the legal aspects and maybe it wouldn't be legal under current laws, but the technological aspects are very feasible, though admittedly there would be some complexities to minimize cheating. It wouldn't be foolproof, and it'd be important to make GPS-spoofing the app a crime.

[Snorlax94]

I still like a tech-based answer to getting much of the contact information, with little effort, and some loss of privacy (but each individual gets to make that choice, not have it handed down from some government entity).  The so-called Singapore tracking app is one example.

YES THIS. Similar to many posters above, one of my frustrations (and apparently, Governor Newsom's) is that other states are not on lockdown. The Bay Area was the first in the nation to go on lockdown. Let's say the Bay Area and CA gets it under control by June 1. Then people start flying in from all over the country and from other countries, and it starts all over again. Then we will be the first to hammer again, and again. 

IF we had widespread testing and contact tracing, this might work. But, well, I think many of us are similarly frustrated at this point.

I don't know what's in the Singapore App, but based on what I've read bout apps in Korea and China and how they're used, how about this for a technological solution: The Quarantine CA App. This idea is not about contact tracing, so it avoids many of the privacy issues -- it's just about enforcing quarantines or proving immunity.

There could be three levels: (1) Documented immunity, (2) Documented recent test (proving Negative), (3) Quarantined Recently, (4) Newcomer.

When the lockdown lifts, CA could block all new tourists, newly returning people (Category 4 - Newcomer) from entering any non-essential service. Two prove you were quarantined recently, you had to install an (intrusive) app for 14 days and PROVE you stayed at home for the 14 day quarantine. The app could constantly track your location, and you might, for example, take photos or receive calls to prove you are who you say you are, when you say you are there.

Similar to what I've read in China, when CA re-opens, we should block people from entering shopping malls, restaurants, and other non-essential locations until they prove they quarantined.
This would serve many purposes:
1) Protect CA from people flying in and re-spreading the disease
2) Increase compliance with the quarantine (you'll want to prove you've been home for 14+ days)
3) Discourage tourism to CA this summer+fall

We could have reciprocal agreements with other states so if you proved you quarantined for 14 days in say, Oregon, and drove down, CA might honor an Oregon post-quarantine person.

For urgent needs, someone could fly in and take a test at the airport and wait for a quicker clearance while at a quarantine airport hotel.

If the privacy issues could be dealt with, then known exposure could knock you back down to category 4 (let's say a co-worker or a child at your child's school tested positive). But this could be very hard to do due to privacy concerns, so this part wouldn't be required in the 1.0

I don't know about the legal aspects and maybe it wouldn't be legal under current laws, but the technological aspects are very feasible, though admittedly there would be some complexities to minimize cheating. It wouldn't be foolproof, and it'd be important to make GPS-spoofing the app a crime.