When I put a value into the given-names textfield in the search box and then tried to execute a search I got back an error message which began with the following:

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'c.given' in 'where clause''

It took a couple of hours wading through the form, and the json and zend code working with the form and the data model until I found this line of code in includes/classes/Search.php

protected function _prepareCriminals() {
$this->_select->joinLeft(
array('c' => 'criminals'),
'c.criminal_id = tf.criminal_id_fk',
array('c.criminal_id', 'c.surname', 'c.given_name', 'c.age')
);
...
if ($this->inData('given-name')) {
$this->_select->where('LOWER(c.given-name) LIKE ?', '%' . strtolower($this->_data['given-name']) . '%');
}

I changed one "given-name" to a "given_name" (see below) and the queries now seem to work:

protected function _prepareCriminals() {
$this->_select->joinLeft(
array('c' => 'criminals'),
'c.criminal_id = tf.criminal_id_fk',
array('c.criminal_id', 'c.surname', 'c.given_name', 'c.age')
);

if ($this->inData('given-name')) {
$this->_select->where('LOWER(c.given_name) LIKE ?', '%' . strtolower($this->_data['given-name']) . '%');
}

so, apparently because given-name was not a member of the c array, the instance of LOWER(c.given-name) was interpreted as LOWER(c.given)-name. name of course was null so presumably had no effect, resulting in c.given being the name of the field in the table to search, which of course doesn't exist generating the error I saw.