I doubt very much if holding cannabis in your hand would show up in a blood test.
can pot enter your pores
Nuclear Pores
Water alone cannot enter your pores because it isn't dense enough to go inside and clean your pores. Soap is used to make water dense enough to enter the pores and clean them, making you a lot more cleaner.
Nucleus Pores
Stomatal pores
Nucleus is enclosed in double walled nuclear membrane. Nuclear membrane at certain distance have pores in them which are called nuclear pores. Nuclear pores are very selectively permeable.
Cell membrane
Allow materials to enter and leave the sponge
Pores called stomata, which open and close by guard cells.
They selectively allow certain size molecules to enter, or not to enter, the cell.
The purification in molecular sieve chromatography is dependent on the size of the molecules. The small molecules will enter into pores of gel while large molecules will be excluded from the pores.
co2 entres through small pores called stomata present on leaves of plants.