Nah, they have it wrong. First of all injecting insulin under his tongue would be tedious outside of him sleeping, as well as the 2 hour driving. Obviously first you should poison his drink, killing him instantly or within a few minutes, before taking the body and cutting it limb segments. Under the cover of darkness the next night (Or current night) make your way to a nearby public trail, the time to get there not mattering, and dig a 7 foot hole into the ground utilizing a shovel, before taking nearby underbrush and covering the area. After that, take your shovel and dig up multiple areas (Near public areas or areas police may investigate), leaving obvious trail that somebody had dug, but not any evidence it was per say you. Utilizing a private airplane fly across the border then to a nearby country which the country you have killed the person in has bad terms in, effectively putting you out of the police’s boundary of investigation (For the most part). BUT before you take your air trip utilize dynamite to blow the interior of your house (Particularly your bedroom), taking a small dosing of your husband’s and your blood to put around the site of the explosion and bedroom so the police have evidence that both you and your husband were in the explosion (Or so they think). THAT’S how to effectively kill your husband.

Oh wait… you now realize it’s Serbia and nobody fucking cares. 🗿