One third of follow-up calls made to passengers who arrived in the State and were required to self-isolate were not answered, according to figures obtained by RTÉ News from the Department of Justice.
Since 28 May it has been mandatory by law to fill in a Covid-19 Passenger Locator Form if you arrive in Ireland from another country.
You are also asked to self-isolate for 14 days. Nearly 30,000 (29,645) passengers arrived into Ireland from 28 May to 21 June through Dublin Airport, Dublin Port, Cork Airport and Rosslare Europort.
One third of the passengers - 9,596 - were exempt from a follow-up call as their final destination was Northern Ireland, they were in the State for less than two days, or they filled out the form unnecessarily.