Arthashastra
काल कूट आदिर् विष वर्गः श्रद्धेय देश वेष शिल्प भाषा अभिजन अपदेशैः कुब्ज वामन किरात मूक बधिर जड अन्धच् छद्मभिर् म्लेच्छ जातीयैर् अभिप्रेतैः स्त्रीभिः पुम्भिश् च पर शरीर उपभोगेष्व् अवधातव्यः ॥
Through the instrumentality of such men or women of Mlechchha class as can put on disguises, appropriate to different countries, arts, or professions, or as can put on the appearance of a hump-backed, dwarfish, or short-sized person, or of a dumb, deaf, idiot, or blind person, kálakúta and other manifold poisons should be administered in the diet and other physical enjoyments of the wicked.
english translation
kAla kUTa Adir viSa vargaH zraddheya deza veSa zilpa bhASA abhijana apadezaiH kubja vAmana kirAta mUka badhira jaDa andhac chadmabhir mleccha jAtIyair abhipretaiH strIbhiH pumbhiz ca para zarIra upabhogeSv avadhAtavyaH ॥
hk transliteration by Sanscript