Grain concentrated in a large storage bin can be maliciously contaminated much more easily than crops standing in the field. Storage bins that hold 10,000 bushels of grain, or more, are common on modern farms. A one-gallon pail of a contaminant dumped into the top of a bin could make the entire bin unmarketable. The following practices can help secure crops in storage:

* Secure and lock storage bins.
* Consider installing electronic door sensors.
* Keep a current, accurate, and well-maintained inventory of commodity crops and seed in storage in bins and storage buildings, as well as accurate inventory records showing the origin and/or destination of the crop and the seed.
* Mark the bins with a numbering system corresponding to your inventory sheet.
* Do not mark bins in such a way that would allow visitors to determine the type of product in the bin.
* Restrict access to all grain-handling facilities such as augers, grain legs, grain vacuums, wagons, and trucks.
* Restrict visitors to the site.