Its not a call of 'good kid' or 'bad kid'.  Monitoring is the effective way to prevent cheating.

Sometimes,letting students know that some of the info they will recieve ir outdated, yet they are responsibble for it any,  Explaining that it may be founadtional to later information helps too.

I have taught several of my classes over and over, becoming too familiar with them.  In putting together a syllabus, I need to remember this all new to new students and write it from their veiw.