Why is chroot system call not available to non root user

chrootsetuid

I was reading description about setuid on wikipedia
http://en.wikipedia.org/wiki/Setuid

I was unable to understand how chroot is related to setuid as mention in following paragraph from wikipedia

The presence of setuid executables explains why the chroot system call
is not available to non-root users on Unix. See limitations of chroot
for more details.

Best Answer

If a non-privileged user could execute a setuid program in a chroot jail, they could carefully construct that jail to trick the program into escalating privileges. For example, I can construct a chroot jail in which I'm permitted to use sudo, because I can control every configuration file inside that jail.

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