O dan y bartneriaeth newydd bydd Cadw yn ymuno â Chyngor Cenedlaethol Penaethiaid yr Heddlu, Gwasanaeth Erlyn y Goron a Historic England fel rhan o ARCH: Cynghrair i Leihau Troseddau yn erbyn Treftadaeth.  Mae’r fenter ar y cyd yn mynd i’r afael â throseddau yn systematig a’u lleihau megis lladrad pensaernïol, gan gynnwys dwyn metel a charreg, difrod troseddol ac yn benodol fandaliaeth, graffiti a thanau bwriadol, defnyddio datgelyddion metel yn anghyfreithlon ac ymddygiadau gwrthgymdeithasol fel niwsans cerbydau a dympio gwastraff.
The new partnership will see Cadw join with the National Police Chiefs’ Council, Crown Prosecution Service and Historic England as part of ARCH: Alliance to Reduce Crime against Heritage. The joint initiative is set to systematically tackle and reduce offences such as architectural theft, including the theft of metal and stone, criminal damage in particular vandalism, graffiti and arson, unlawful metal detecting and anti-social behaviours such as vehicle nuisance and the dumping of waste.