 [ Symptoms ] laminectomyfusion gone wrong i had a laminectomy and fusion 4 yrs ago i have been in pain since about 1 mo after finally i got some test results 2 mo ago that no dr can deny to show that the fusion did not take the screws are loose and the bolt ends are floating around i am having pain of all sorts and nerve issues i never know what the new day will bring when i can sleep i doubt very much but is there a reasonable explanation for either andor both surgeries to have gone wrong [ Disease ] to answer your first question no a urine test that checks for bacteria will not look for other substances in the urine to your second question if you inhale a small amount of secondhand marijuana smoke might it show up on a drug screen test i would guess it is doubtful but not impossible it definitely will not show up on a urine culture designed to check for bacteria i hope that helps