Also, in the Golden Vajra's Yoke (gSer gyi rdo rje'i gnya' shing), the code of rules of Tashi Lhunpo Monastery composed by Panchen Tenpai Wangchuk (1855-82) we find the following statement:

Recently, it seems some cases of invoking ghosts (through mediums) within the compound of the monastery have taken place. In future, except for special dharma protectors like the Lamo Choekyong, (or Lamo Tsangpa, a special protector of the Tashi Lhunpo Monastery) summoning different kinds of spirits to enter into mediums will be prohibited. Dharma protectors should be Vajra protectors possessing transcendental wisdom. Propitiating and taking refuge in evil spirits and ghosts like Dholgyal, that are wandering hungry spirits, contradicts the fundamental precepts of taking refuge in the Three Jewels, which is what distinguishes a Buddhist. Therefore, such practices should be given up.