The area of your production halls has clearly given boundaries, but still have a lot of trouble with uninvited guests who are making you a dissected? Do you have a security guard and much more has not improved? Do you even feed the dog? Are you thinking of deploying one more? Do you have electronic security? If you don't have it, then find out what it takes and look for it. What about the area? Mesh? Just mesh? You have to swap!
Only that and nothing else
Only with the concrete fence around your premises and electronic security you can sleep peacefully. After agreement with the company, which is the leader in this field, your area will be bounded within one, maybe two days, and you can be seriously at rest, what the production halls are concerned with! That you didn't think sooner? I'm surprised!