Is it true that hallucinogens can be transferred through skin?

Sometimes the claim is made that if you are tripping on shrooms or LSD touching small animals (i.e. gerbils, cats, small dogs, etc) will make them trip because hallucinogens are skin transferable.

There is no truth to this misconception. Neither ingested psilocybin, nor LSD can be transferred through contact with someone's skin.

This myth is most likely rooted in the fact that d-lysergic acid diethylamide (LSD) in its purest form (powder) can in fact be absorbed into the body through contact with the skin or mucous membranes such as the nose, mouth, or eyes. Psilocybin/psilocin also are absorbed through mucous membranes and sensitive skin, along with other "less pure" forms of LSD.

Can You Touch Certain Plants & Experience Them?
There are certain psychedelic plants that can transfer their properties through the skin, namely the famous plant Datura (Stramonium or Metel), which contain the alkaloid "scopolamine." Certain other herbs and plants contain oils which are transferred through the skin by handling the leaf, herb or roots. These oils can contain psychoactive alkaloids and their effects can be observed as a result of handling alone.