The official responsible for procurement with the cantonal police force is suspected of having sold weapons on a German dark web forum known as Spackentreff.
The forum, now shut down, was the source of the weapon used in the July 2016 attack in Munich in which nine people were killed by an 18-year-old gunman.
The Swiss logistics chief was arrested in February after Swiss prosecutors received information from German investigators who were working on the theory the Swiss police procurer was one half of the Spackentreff forum member ‘Clultimate'.
This forum member offered items for sale including sniper rifles, Glock pistols and Swiss army rifles, according to Swiss daily Tages Anzeiger.
Investigators in German believe the Swiss man was working with a young German partner, who is currently in prison. Both members of the duo had access to the dark net account, according to German authorities.
The head of police in the canton of Schwyz told Tages Anzeiger that no service weapons were missing but that “irregularities” in ordering processes were being investigated.
The newspaper said that according to it own research tens of thousands of francs worth of munitions were currently unaccounted for.
A February raid of the police logistics chief's house turn up so many weapons, a second, larger vehicle had to be called in.
The official is being investigated for violation of Swiss weapons laws, misuse of public office and violation of professional secrecy.
But the man is not being held in custody with federal prosecutors stating there is no flight risk and no risk of collusion.
The prosecutors' office also said the weapon used in the 2016 Munich shooting had not come from Switzerland and had not been supplied by the former Schwyz police logistics chief.