Suspicious Scattering is a mod that allows you to place items inside suspicious blocks.

To place an item inside a suspicious block (suspicious sand/suspicious gravel), you have to brush it three times until it is at the maximum dusted stage. When you reach that stage, quickly right click the block to place your item. The item will remain inside the suspicious block until someone brushes it off or the suspicious block breaks.

How do I get a suspicious block?

You can get an empty suspicious block in your inventory following this method:

1. Place water and soul sand under the block under the block like this:

2. Break the block under the suspicious sand. The suspicious sand will fall and, after a while, despawn and drop itself.