To help prevent an American Kestrel from carrying, you should?

Using a weighted lure line is effective in preventing an American Kestrel from carrying because it provides resistance against strong flight impulses and encourages the falcon to focus on the lure rather than gaining altitude and flying away. The additional weight helps to control the bird's flight path, making it less likely to feel the need to carry the lure. This technique allows the falconer to manage the bird more effectively during training and hunting sessions while ensuring safety and promoting successful hunting behavior.

The other options, while useful in their own contexts, do not directly address the specific issue of carrying. Lightweight lures can be appealing for training but may not provide sufficient control to prevent the bird from flying off with them. Flying the bird only when it is in yarak, or in the right mindset to hunt, does play a role in successful training but does not mitigate the risk of carrying during flight. Using a halsband can be a useful tool for other behavioral control purposes but does not specifically address the prevention of the kestrel carrying the lure.