A retired detective has told Ian Bailey's damages action that it is not a legitimate garda technique to arrest a partner in order to put pressure on a suspect.
The former journalist is suing the State and Garda Commissioner for alleged wrongful arrest over the Sophie Toscan du Plantier murder in west Cork in December 1996.
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His partner Jules Thomas was also arrested for questioning in February 1997 as part of the investigation.
State witness retired detective James B Hanley, who was involved in the case, is being cross examined.
