The narcotics were seized from three drug dealers, who were also taken into custody.
Hakizimana, 23, was arrested in Hanika Village, Makoro Cell in Busasamana Sector of Rubavu District with 7.5kgs of cannabis.
Two other suspects; Theoneste Kavamahanga, 25, and Innocent Karibana, 28, were arrested in Gicumbi District transporting 5kgs of cannabis on a motocycle.
Chief Inspector of Police (CIP) Bonaventure Twizere Karekezi, the Police spokesperson for the Western region said Hakizimana was reported by residents.
"Area residents reported that Hakizimana was seen in Hanika Village trafficking drugs in a bag, heading to Nyabihu. We swiftly responded to the tip-off and Hakizimana was arrested red-handed with 7.5kgs of cannabis," said CIP Karekezi.
On the other hand, Theoneste Kavamahanga had hired Innocent Karibana, a taxi-moto operator to transport him and his 5kgs of cannabis before they were intercepted in Cyumba Sector, Gicumbi District.
It was later established that the suspects acquired the drugs in Kanyanzugi Village, Nyirataba Cell, Kivuye Sector in Burera District.
At the time of their arrest, Kavamahanga was headed to Kanteko Village, Taba Cell in Gashenyi Sector, Gakenke District where Kavamahanga lives.
The suspects were handed to RIB at Busasamana and Cyumba stations for further investigation.
Cannabis is classified among the very severe narcotic drugs in Rwanda.
Article 263 of law No 68/2018 of 30/08/2018 determining offenses and penalties in general states that any person, who unlawfully produces, transforms, transports, stores, gives to another or sells narcotic drugs and psychotropic substances commits an offence.
Upon conviction for "very severe narcotics," the offender faces between 20 years and life imprisonment, and a fine of up to Rwf30 million.