Academics have specialist search tools to check for plagarism, but us normal folks just plug a few words onto a good web search engine and see if any hits are registered.
Companies that sell essays to cheating students do usually publish a small sample of the essay as a 'taster' for customers but the bulk of it is not available to search engines, so you'll not find hits in that manner.
You can determine if a paper is plagiarized by using online plagiarism detection tools, comparing the paper to other sources, and looking for inconsistencies in writing style or language.
Adina's Deck The Case of the Plagiarized Paper - 2008 was released on: USA: 31 October 2008 (limited)
Pretty much every author of any significance has been plagiarized at some point.
The Universe.
Shakespeare.
Many authors have been.
To see if your paper has been plagiarized, visit www.duplichecker.com. After entering your text, the program will check each sentence against indexed website pages.
Stephenie Meyer
The only reason that this sentence is not incomprehensible is because it has been plagiarized.
I would suggest asking the teacher to provide evidence.
People plagiarize when they take written things from you and claim they wrote them.
Megan McCafferty