The staff members were working at the Swedish Customs offices in Helsingborg, where they grew marijuana plants behind closed doors on the premises. The pair were reported for professional misconduct after growing a small number of plants.
"But there are also suspicions of narcotics crimes. In itself, it's no serious narcotics crime, it's not exactly like they had an amphetamine lab," prosecutor Mats Eriksson told the Helsingborg Dagbladet newspaper (HD).
"The serious thing is that this occurred at Swedish Customs and that it was during working hours."
According to the paper, the suspects claimed that they were only growing the plants as an experiment "to find out how fast they grow".
Authorities at Swedish Customs have refused to comment on the find, and have not indicated whether the employees have been fired. However, the paper reports that the two men have been temporarily replaced and had their keys confiscated.
An investigation has been launched by Malmö police.