Thanks... and they already have lost two.

What are the laws, rules, and regulations that affect or "protect" Senators and Reps carrying out their sworn duties? I am remembering old stories (pre-internet, pre-tech, physical presence being the only option) about Sens/Reps rushing back to The Hill to cast votes.  
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Pulled over for speeding? Cannot be further detained; must be set free to return, even breaking the local speeding laws, to vote.
Other crimes or misdemeanors or tactics that would prevent a Sen or Rep from getting to the vote?  Sen or Rep MUST be allowed to get to the Chambers to vote.  
Petty or even false detention of a representative of the people is a tactic used by dictators and authoritarians in some countries and it should not be allowed to happen.  However, ...
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I imagine that pesky rules of quarantining or isolating or masking cannot stop a sick (double meaning intended) Sen forcing their way OUT of quarantine and INTO the Sen Chambers.  
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The issue at hand is not a Declaration of War against an enemy actively bombing our homeland. It is an issue that the Republicans have already declared and shown to be that the SCOTUS votes can be delayed for months and months (Feb 2016 [Scalia's death] until April 2017 [Gorsuch approval]).
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If you are a sick-o Sen, stay quarantined. Let the healthy members present vote or delay the vote.