The interpretation of the legislation (Risk Mitigation Measures “RMM”) clearly recommends that the client works with the professional. But only for traps. This is strictly prohibited for rodenticides.
“Accompanying measures during or after the rodent control measure with 2nd gen. anticoagulants (…) as well as searching for and disposing of dead rodents, setting traps and checking monitors or carrying out organizational IPM measures may be carried out by non-professional pest controllers, after instruction by the pest controller.”
The instruction could, for example, be an email explaining how the traps are set / emptied, or a video or ideally an on-site demo of the trap so that the customer has been instructed in person. This means that autonomous control on the customer side is 100% intentional and legally legitimate.
As long as this activity is not carried out “commercially” and the main business of the company is still, for example, a bakery, it is 100% compliant with §4 of the Animal Welfare Act.