lethal injection vs writ of execution

lethal injection

noun
  • A means of execution or of euthanasia in which a person is injected with a fatal dose of drugs. 

writ of execution

noun
  • a court order authorising an officer to carry a judgment into execution. 

  • a court order authorising an officer to seize and sell the judgment debtor's property in order to pay his judgment debt. 

How often have the words lethal injection and writ of execution occurred in a corpus of books? (source: Google Ngram Viewer )