Pre-written Lessons

In my placement this week I taught a science lesson. I was given the basic lesson by my CT, and was told not to modify it if possible. At first, I wasn't sure if I liked the idea of having lessons handed to me. I felt it was almost lazy to simply present a lesson created for me. After looking over it however, I realized that many of the supplies that the school purchases to go along with these lessons are supplies that I might have difficulty getting a hold of myself. By only slightly modifying the lesson, the standards that needed to met, were reached. The students seemed to love the activity, and I was stress free. I do wonder however who chooses the lessons that will be purchased my the school district. It worries me that perhaps the wrong people will be responsible for this, and may choose something that does not meet the needs to the students.