Yes, home security signs can deter intrusions in McAllen
Various studies say security signs are effective when attempting to deter an intrusion. The reasoning is that the thief will see the sign and instantly determine that your home isn't worth the hassle. Ultimately, why worry about cameras and sensors when a intruder can hit an unprotected mark somewhere else?
With that being said, the same reports show that a visible display isn’t the most intimidating intrusion impediment. A wisely situated sign mostly discourages amateur thieves, but professional crooks may want to see the extent of security that is actually shielding your house before looking the other way. Other equipment, like security cameras, do a much better job preventing an intrusion.