The unrepeatable tests for now concern 30 of the 68 items seized from the home of the couple Luigi Gulisano and Marisa Dessì , 79 and 82 years old, killed last December 5 in their home on via Ghibli, and from that of their son Claudio, 44 years old, who ended up in prison accused of the double homicide of his parents , poisoned – according to the reconstruction of the investigators – for economic reasons. Cell phones, tablets, food remains, biological traces, the blood stain (found on the shoe of one of the two victims) and other objects will be analyzed by the RIS experts in search of evidence that confirms the heavy burden on the youngest child of the couple.

Unrepeatable tests began yesterday morning with the procedures in the RIS barracks , in San Bartolomeo, in the presence of the lawyer Luigi Sanna (defender of Claudio Gulisano and who appointed a consultant, the toxicologist Domenico Meloni) and his colleague Gianluca Aste who is assisting his eldest son, Davide (46 years old), considered by the Prosecutor's Office to be the injured party.

Of particular importance will be the fingerprint tests on the couple's cell phones, on the cordless phone recovered in via Ghibli and on Claudio Gulisano's cell phone. We need to figure out who the last people to use them were. Another fundamental step is the analysis of the food remains: we are looking for confirmation that sodium nitrite was what poisoned the former salesman and his wife . The suspicion is that it was disguised - due to its similarity - with sugar or salt . All the evidence will be searched for any traces of DNA . And even the blood stain , found on Luigi Gulisano's shoe, will be thoroughly analyzed to establish who it belongs to.

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