Only by Catholic reckoning. The Protestant churches that retain the sacrament of the Eucharist offer it to all baptized adult Christians without distinction.
-ccm
Protestant ministers have no apostolic authority, they simply oversea a mimicking of the Sacrament of Communion not the sacramental representation of the one time sacrifice of Jesus Christ that can only occur with valid apostolic authority through the laying of hands by those who have received that authority to do so.
Since in a protestant gathering it can only remain a piece of bread, anybody should be able to grab a piece..except for a Catholic or Orthodox Christian who understand St. Paul's admonition:
For I received from the Lord what I also handed on to you, that the Lord Jesus, on the night he was handed over, took bread, 24
and, after he had given thanks, broke it and said, "This is my body that is for you. Do this in remembrance of me." 25
In the same way also the cup, after supper, saying, "This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me." 26
For as often as you eat this bread and drink the cup, you proclaim the death of the Lord until he comes. 27
Therefore whoever eats the bread or drinks the cup of the Lord unworthily will have to answer for the body and blood of the Lord. 12 28
A person should examine himself, 13 and so eat the bread and drink the cup. 29
For anyone who eats and drinks without discerning the body, eats and drinks judgment 14 on himself.
No, we 'fence the table'.
"the minister, at the discretion of the Session, before the observance begins, may either invite all those who profess the true religion, and are communicants in good standing in any evangelical church, to participate in the ordinance; or may invite those who have been approved by the Session, after having given indication of their desire to participate."
The ignorant and the scandalous are also to be excluded.