Bangkok and Singapore this week, temperature checks in and out before immigration. Heathrow and Zurich last week, no checks.
Appalling. At least the first two are better. Really need checks before check in; avoids the hassle of intercepting baggage for those refused emmigration.
Years ago you were not allowed into Chennai terminal without a boarding card. In that case it was security but the principle is the same. Intercept and check as early as possible. As important, check staff every day.