Rubuta ci gaba don wannan sakin layi - Carstares an sa shi zuwa Hasumiyar London; a shekara mai zuwa, 1675, an canja shi zuwa Edinburgh Castle. An yi imanin cewa ya damu da Sir James Stewart a cikin rubutun wani ɗan littafin "A Account of Scotland's Grievances by reason of the D. of Lauderdale's Ministrie, da tawali'u ga Mai Tsarki Mai Tsarki" (1674). John Maitland, 1st Duke na Lauderdale da kansa ya sa Carstares ya yarda cewa ya shiga cikin buga littafin. Lauderdale ya yi amfani da barazanar azabtar da boot, wanda za a iya amfani da shi bisa doka a Scotland; amma ba a azabtar da Carstares ba. A watan Agusta 1679 an sake shi, daya daga cikin masu goyon bayan gwamnati ga ra'ayin Scottish bayan yakin Bothwell Bridge
Ka yi haƙuri. Saboda haka ba zai iya zama William Carstares ba wanda shine babban mai gabatar da kara a shari'ar William Staley (na farko na shari'ar Popish Plot) a watan Nuwamba 1678, kodayake Carstares shi ma ɗan Scotsman ne, kuma kamar sunansa an ce ya yi aiki a matsayin wakilin leken asiri.