On Tuesday, two men were arrested in County Cavan in connection with Mr Kerin's murder.
Cavan attacked frantically and almost created a goal chance but Antrim got home by three points.
Cavan-Monaghan Senator Diarmuid Wilson accused Mr Elderfield of being "heavy-handed" and acting with haste.
Meanwhile, Antrim and Cavan will play their opening Tommy Murphy Cup games the weekend after next.
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Aisling McCarthy Brady, 34, from County Cavan, has been living in the US since 2002.
Cavan was remanded in custody with a tariff due to be set at a later date.
Derry enjoyed a slender 1-12 to 1-10 advantage over Cavan in their game at Breffni Park on Saturday night.
Laid off last year in Ireland, the 42-year-old arrived in Moose Jaw from County Cavan this month.
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The search is taking place under the patio at the home of former detective John Kerins near Bailieborough, County Cavan.
In the end, the road was reopened when a temporary bridge was erected from the County Cavan side.
Visitors Derry got their McKenna Cup campaign off to an impressive start thanks to a 1-12 to 1-10 win over Cavan.
But he will be allowed home for three days to be with his family in Ballyconnell, County Cavan.
But suddenly the situation changed as substitute David Gibney turned to shoot in the goal which revived Cavan's hopes.
Derry face Queen's at Celtic Park with both teams on maximum points after opening wins over Cavan and Monaghan.
Horse DNA was discovered at plants in Monaghan and Cavan in the Irish Republic and in Yorkshire in January.
Antrim will open up with a home game against minnows Kilkenny while Cavan have an away tie against Roscommon.
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Derry hope to build on their wins over Cavan and Queen's in the past week when they take on Monaghan.
It is one of the biggest employers in Fermanagh, where Mr Quinn grew up and neighbouring Cavan, where he now lives.
Cavan lightweight Andrew Murray also maintained his unbeateh record by stopping Frenchman Tony Jourda in the third round of their bout.
Several thousand people attended a rally in Ballyconnell, County Cavan, on 28 July Sunday to show their support for the family.
Cavan looked to have struck a crucial blow when Watters slammed in his team's first goal six minutes into the second half.
At the moment it has one TD - member of the Irish parliament - Caomhghin O'Caolain who represents the constituency of Cavan-Monaghan.
Captain John Brooke, unionist Chief Whip and Chairman of Fermanagh County Council blamed Lord Kilbracken and Cavan County Council for the deaths.
Finbarr O'Reilly's point edged Cavan ahead again inside the final 10 minutes but Danny Hughes' 65th-minute goal put Down 1-14 to 1-12 ahead.
Conleth Gilligan hit five points from play in the 1-12 to 1-10 win over Cavan while Paddy Bradley also was in fine form.
The Slieve Russell hotel in County Cavan, also in the Republic, will be hosting part of a G8 delegation, thought to be Americans.
Cavan's top marksman was youngster Michael Lyng who rifled over four frees while the excellent Gerald Pearson found the target with three points.
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Derry continued to perform strongly on the restart, but Cavan dug deep in the closing stages, holding the visitors to just 1-1 in the second half.
Cavan were dealt a major blow midway through the half as they lost their goalkeeper James Reilly through injury and he was replaced by David Ward.
Cavan's first four points came from Seanie Johnston but Antrim kept their noses in front through Michael McCann (2), James Loughery and Paddy Cunningham.
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