4 plants.. in canada. your good to go buddy. but if you dont trust someone, why the hell are you letting them in your home?
ive had a couple nosy friends.. "did you grow this?" famous question when someone gets nugs. i accidentally left bamboo stakes, a tomato cage and a co2 tank in my living room one time i came home from the hydro store.. homie came over and immediately " i didnt know you grow!"
i froze up... after mumbling trying to get him to forget about it.. i decided to show him my spare bedroom with my 4x4 tent with 2 moms in it. he did the whole " ohhh, thats cool" as if he was disappointed that im a noob with 2 plants that dont look healthy lol.
you live in canada.. where everyone grows weed for a living, let alone a closet grow. if your worried about him snitching on you.. sit him down and show him the whole thing, chances are he wont be amazed by a few plants, then tell him that your trusting him with a big secret and if he runs his mouth your going to shove your foot in it.
good luck bud