From 1 May 2021 on all external users of the PSI facilities SLS, SwissFEL, SINQ, SmuS and CHRISP must
present a certificate of a negative PCR test for SARS-CoV-2 according to Swiss BAG rules for air travel
(i.e. currently with the date of the result being not older than 72 hrs when arriving at PSI, NO self-testing).
'External' means: both not being affiliated to PSI and without a long-term or permanent PSI access badge.