In Norway if you have symptoms but not been tested you are allowed in the shops and work again one day after symptoms subside as "the chance of infecting someone drops drastically at the end of the infection" [1].

If you have a positive test you still have to stay in for seven days but they don't tell you why since the argument for the non-tested should also apply to the ones with a positive test.

However there is no hard data here but I think these anti-body tests are better for statistics than prevention. Maybe you could even get a "corona passport" so that when you have had it and become immune you have more freedom.

[1] https://www.fhi.no/nettpub/coronavirus/rad-til-personer-som-... (Norwegian)

Only people without symptoms and with proof of antibodies should be allowed to move freely. Everyone else who isn't an essential worker should be isolated until there is a vaccine. It's the only way to make H0 stay below 1.0 and stop this crisis fastest. There are too many people flaunting the isolation orders and risking the health of everyone for their arrogant, selfish recklessness.

Is there actual evidence of antibodies? I have yet to see the evidence.

This is meaningless. rtPCR is the gold standard, which this obviously isn't. Testing for antibodies is clinically-worthless except for who is now immune or had it in the past and doesn't need a vaccine.