In recent weeks, the investigation surrounding 3-year-old Madeleine McCann's 2007 disappearance from her parents' hotel room in Praia da Luz, Portugal, has ramped up. Following the identification of Christian Brückner as a prime suspect, police have taken new steps as they attempt to discover details that could ultimately lead to McCann's case being solved. Now, a report has indicated that law enforcement may be getting ready to retest a DNA sample that was taken from Kate and Gerry McCann's hotel room that could help further the investigation. 

According to Metro, German authorities have reportedly asked Portuguese police for any evidence they have pertaining to Brückner, including a saliva sample. As stated by the publication, they are interested in retesting the DNA sample that was taken from the crime scene in order to see if it matches Brückner's. However, Portuguese daily Correio da Manha indicated that the specific sample had "little identification value."

READ: Madeleine McCann Update: Prime Suspect's Past May Link Him To Another Missing Girl

Previously, Portuguese state prosecutors indicated that they had received four requests for international judicial cooperation relating to the McCann case, but did not specify who had asked for the access. However, it has been reported been that officials would only "act on the ground again if the German authorities indicate specific places where Madeleine’s body could be hidden," which could include wells and burrows.

At this time, the evidence from Portugal is said to be "insufficient to conduct searches" unless another clue emerges.

It has also been reported that investigators want to make use of a piece of German legislation that would allow German nationals to be tried for crimes that they allegedly committed outside of the country.

READ: Madeleine McCann Update: 'Knockout' Evidence In Case Could Be Provided By Unexpected People

Prior to the latest development on the McCann case, which some once believed was "unsolvable," other reports indicated how the investigation was moving forward following Brückner's identification. Not only was it stated that he may have been tipped off by a "crooked hotel worker" around the time of her disappearance, but that evidence directly tying him to the crime could have been destroyed

mccann 2 Kate and Gerry McCann display a poster of their missing daughter Madeleine McCann during a press conference on June 6, 2007, in Berlin, Germany. Photo: Miguel Villagran/Getty Images